Android ADB doesn't see device - android

I'm trying to run my applications on OMEGA T107 tablet. But adb doesn't see my device. I tried almost everything.

Some of these answers are pretty old, so maybe it's changed in recent times, but I had similar issues and I solved it by:
Loading the USB drivers for the device - Samsung S6
Enable Developer tools on the phone.
On the device, go to Settings - Applications - Development - Check USB Debugging
Reboot O/S (Windows 7 - 64bit)
Open Visual Studio
I think it was step 3 that had me stumped for a while. I'd enabled developer tools, but I didn't specifically enable the "USB Debugging" but.

I tried all the ways listed on the web for a whole day, but I didn't get any solutions. Then, I followed a link and in just two minutes my problem was solved!
By the way, it's for Windows users!
Find out the vendor id of the device from device manager.
To do this, connect the OTG port to the USB port of your computer.
Go to Start Menu and right-click on “My Computer” and chose “Properties”.
Select the “Devices” option which will open “Device Manager”.
Select your device (mostly in USB devices or Other devices) and right-click and choose “Properties”.
Choose the “Details” tab and select “Hardware Ids” from the property dropdown, you can see the hardware id, in my case it was x2207 .
Open android_winusb.inf and add these lines:
;<Device name> in our case I gave MK808
%SingleAdbInterface% = USB_INSTALL, USB\VID_2207&PID_0010&MI_01
%CompositeAdbInterface% = USB_INSTALL, USB\VID_2207&PID_0010&REV_0222&MI_01
Open C:\Users\.android\adb_usb.ini and add the following entry
0x<device id> .. in our case it is 0x2207
Restart ADB by
adb kill-server
adb start-server
Now ADB should recognize the device.

I had same issue, none of the solutions worked for me.
Open Settings Menu -> Developer Options -> USB Debugging should be on
Android 11
Settings -> System -> Developer options -> USB debugging

The normal way to fix this is indeed to restart the adb server :
adb kill-server
adb start-server
then
adb devices -l
should list connected devices
But it possible that it doesnt fix the problem. It appends to me.
I had to disable/enable the debug mode on the device, and then restart adb server.

On Windows it is most probably that the device drivers are not installed properly.
First, install Google USB Driver from Android SDK Manager.
Then, go to Start, right-click on My Computer, select Properties and go to Device Manager on the left. Locate you device under Other Devices (Unknown devices, USB Devices). Right-click on it and select Properties. Navigate to Driver tab. Select Update Driver and then Browse my computer for driver software. Choose %ANDROID_SDK_HOME%\extras\google\usb_driver directory. Windows should find and install drivers there. Then run adb kill-server. Next time you do adb devices the device should be in the list.

Not all USB cables can transfer data. Try using a different USB cable if your device is charging, but doesn't establish a connection to your machine.
Read more: How to tell a USB charge-only cable from a USB data cable - Dignited

What operating system are you on? If you running Windows you will want to make sure you have the drivers. You should also make sure that your Android SDK Manager is not only installed, but it also contains some additional things for different devices. Not sure if yours is in there or not.
Make sure that your phone has debugging enabled. I found myself having to run
adb kill-server
adb devices
often.

On windows, you will need to install drivers for the device for adb to recognize it. To see if the drivers are installed, check the device manager. If there is any "unrecognized device" in the device manager, the drivers are not installed. You can usually get the adb drivers from the manufacturers.

For Windows 8 64 bit with a Nexus 10 device, this worked for me:
https://github.com/koush/UniversalAdbDriver
It has a link at the bottom to this:
http://download.clockworkmod.com/test/UniversalAdbDriverSetup.msi

It worked for me in my Astro Tab A737
Download and install PdaNet+ from http://pdanet.co/a/ in your computer.
follow all steps in the wizard while installing .Once the drivers are installed Android studio should recognize the tablet.
Also, make sure the device is in PTP mode.

Uninstalling all old "Android ADB Interface" drivers that were installed previously and then installing the new one worked for me.

Debugging needs to be enabled on the target device in order for adb to see it.

Intel has a peach of an article on this. It's all the same driver. It's just a Device ID mismatch in the Inf file which can be edited, or Windows forced to Install the driver we point it to. Intel's article is very thorough and takes care of every hurdle you come across. The link - https://software.intel.com/en-us/xdk/docs/installing-android-debug-bridge-adb-usb-driver-on-windows

Keep in mind while you connecting device Android propose to select one of possible connection options.
In my case:
File transfer
Power charging
Media
Not all types of connection will work with ADB. In my case need to select Power charging to be able to connect to ADB

Go to Device Manager
Right-click Android Composite ADB Interface
Uninstall devices
Right-click your LocalPC then select Scan for hardware changes
Your device should be enabled
Open Command Prompt
adb kill-server
adb start-server
adb devices

Related

Xperia E1 not recognized by Eclipse

I can't seem to make eclipse recognize my Xperia E1 as an ADB device.
The problem is that in the devices list of eclipse it is detected but it says 427ac413 as serial number and the target is unknown. USB Debugging mode is on, I have tried both MSC and MTP modes, I rebooted the device, the ADB Driver is installed from PC Companion (although it says Sony so0107 and not so0101 as I have seen on some other forums). I'm thinking it could either be a driver problem, maybe the wrong one is installed, because the first time I installed it the adb driver said it was from Samsung, and I had to uninstall it and reinstall it.
Any suggestions on how to make it work?
Here are some steps that may work.
Turn off the USB Debugging mode
Connect your phone with both MSC and MTP modes (check that it is accessible in each mode, this means that at least these 2 drivers are fine)
Disconnect phone
Make sure ADT USB Drivers are up to date.
Check that adb is running, better by task manager (If you try at the same time eclipse and cmd adb they mess themselves, red errors about adb start appearing in eclipse console at this case.)
Turn on the USB Debugging mode on the phone, connect it in MSC.
Connect the phone, it should ask for USB debugging access.
In case everything fails.
Try another USB
Try another USB cable, some idiot phones work better by the "authentic" cable Sony with Sony, Samsung with Samsung etc.
Restart phone
Restart computer
On / Off USB Debugging mode with either the phone connected or not.
Try manually driver installation by pointing the folder of PC Companion or ADB drivers
Restart eclipse
If still resists, lets make sure that android connects:
(Close eclipse) Open cmd run adb command
Connect phone on debug mode adb devices check that is online. If yes, its a matter of chance that eclipse recognize it. If no, you may have issues either with adb or with drivers (?).
In case you have issues with adb. Some Companies install an adb in the Phone Suites in order to update phones or access phone data. This adb sets itself in installation at the PATH and starts instead of the Android ADB which is for development. In this case you can run in cmd adb kill-server navigate to android adb location and adb.exe start-server.
In case of the drivers search the net for Xperia E1 android debug drivers and start testing if anything works.
It seems that this issue can be fixed by manually updating the ADB driver through Windows Device Manager. There is a support thread on the Sony Experia Forum that discusses, and provides detailed steps for a solution, this issue:
http://talk.sonymobile.com/t5/Xperia-E-E-dual/ADB-driver-XPERIA-E/td-p/290337
I have solved my problem by following these steps.
The problem was that the SDK_HOME folder wasn't set properly and the PC wasn't authorised. So i disabled developer tools and enabled them again, revoked USB Debugging authorisations and then plugged it back in. The dialog appeared on my phone and then it all worked.
First, you may used the wrong driver, try to get it from here, here, or here.
Then, force the windows to reinstall the driver again:
Choose the device from [device manager].
update driver ----> browse my computer for driver software ----> let me pick from a list... ----> Have Disk.
Browse and choose the proper driver, the press OK.
Last, restart your adb:
from cmd go to /platform-tools directory then write adb kill-server then adb start-server.

can't find android device in eclipse?

I am running android adt bundle in ubuntu and I am unable to connect my Sony Xperia S and run the applications on it. I saw these pages for setting up the hardware device.I have set up the udev rules ,as stated in the instructions and I have been successful to run ./adb devices and it gives a result as
List of devices attached
CB511YVUQC device
Even if the usb device is being shown but i can't see it in the AVD of eclipse.
Please Help.Thanks.
1.Please check Devices list from eclipse. Check this page also Android AVD not recognizing device but ADB does
2.try adb kill-server, adb start-sever
Maybe, you need activate USB Debugging: Settings -> Applications -> Development - Enable USB Debugging
Put your phone in Mass Storage mode(The default USB connection mode is MTP). After that, either reconnect the USB cable or try resetting adb.
Reset ADB from within Eclipse, and your device should show up.
In Eclipse, open the 'DDMS' Perspective, in the 'Devices' tab, in the far right, there is a triangle, inside of that, select 'Reset ADB'
Go in platform-tools and type adb kill-server then adb start-server platform-tools is in your sdk in my case is E:\adt-bundle-windows-x86_64-20140702\sdk\platform-tools

ADB No Devices Found

I am attempting to install an Android app on my brand new Nexus 10. I have a .apk file. I have downloaded the Android SDK, installed "Android SDK Tools", "Android SDK Platform-tools", and Google USB Driver. I have checked the setting on my Nexus 10 for "Unknown Sources".
When I run "adb devices" from the command terminal, it doesn't list any devices. I attempted to follow this recommendation, because it was identical to a suggestion I had previously found here on Stack Overflow. After following those steps, "adb devices" still returns an empty list and to make it worse, when I connect my Nexus 10 to my PC, Windows doesn't show any folders within the device.
I have undone the steps in that link, along with everything else I have done so far, as well as uninstalling my Nexus 10 from Device Manager and reinstalling it, but I am still not seeing any folders in the device.
Is there anything I am missing to get my device to show up in ADB devices?
What can I do to get Windows to see the folders within the device?
Windows 8 wouldn't recognize my Nexus 10 device. Fixed by Setting the transfer mode to Camera (PTP) through the settings dialogue on the device.
Settings > Storage > Menu > USB Computer connection to "Camera (PTP)"
For Windows 8 users:
After trying every solution given here, with no success, I found this:
Go to Device Manager
Browse my computer for drivers -> Let me pick from a list of device drivers on my computer
Choose Android Device and then Android ADB Interface.
Now I have my devices listed at adb devices.
This situation seems to arise with some ADB drivers. I have encountered the same thing with a couple of Google devices and installing the Universal ADB windows driver has fixed it for me every time.
Use another cable.
Just found out that one of my regular charging cables had Vcc, Gnd pairs, but no Data+, Data-.
https://en.wikipedia.org/wiki/USB#Pinouts
Make sure to Enable USB debugging in Settings -> Developer options
Also, run "adb devices" after getting into the platform tools folder in the Android SDK (unless you have that folder on your system path already), otherwise the command won't be found.
The device may not be visible for debugging if it is in MTP mode. Some devices only work in PTP mode (or even in "charging only" mode).
This can be changed in Settings > Developer Options > Networking > Default USB configuration > PTP.
Also, you'll get a notification on your android device asking you for confirmation about USB configuration setting change and to allow it.
Note: You can turn on developer options by following the link below:
enable developer options
I have found a solution (for Windows 7):
Connect your Nexus 10 to PC
Go to Windows Device Manager
RClick on ADB Interface -> properties
Details -> Hardware Ids.
You will see two records like these:
USB\VID_18D1&PID_4EE2
USB\VID_18D1&PID_4EE2&MI_01
5 Open the android_winusb.inf file (I have it in "C:\Users\<username>\AppData\Local\Android\android-sdk\extras\google\usb_driver" directory)
6 Create such records in [Google.NTx86] and [Google.NTamd64] sections using Hardware Ids from properties of ADB interface:
;Google Nexus 10
%SingleAdbInterface% = USB_Install, USB\VID_18D1&PID_4EE2
%CompositeAdbInterface% = USB_Install, USB\VID_18D1&PID_4EE2&MI_01
7 Save the file, and update driver for ADB Interface with showing the path to "C:\Users\\AppData\Local\Android\android-sdk\extras\google\usb_driver" directory
Sometimes ADB loses connection to the device, and needs to be reset. If you have everything else working (ie USB driver installed, Developer settings enabled on the device), and still can't see your device, you need to reset the ADB process.
This is available in the DDMS Perspective (from within Eclipse), Devices tab (the triangle on the far right includes a menu item to perform the reset).
Otherwise from the command line, you can reset it with the following 2 commands:
adb kill-server
then
adb start-server
Enable Developer options in your device. To enable the developer mode, setting->About phone, tap Build number option 8 times continuously
Go to Settings-> Developer options and Turn on USB debugging
From the above steps it didn't work try this step, Go to Settings->Security and turn on Allow Unknown Resources
You have to download the drivers from the SDK manager (extras → Google USB Driver)
Then you have to install the USB driver in Windows (it works for me in Windows 8.1):
(Copy and paste from http://developer.android.com/tools/extras/oem-usb.html#InstallingDriver:)
Connect your Android-powered device to your computer's USB port.
Right-click on "Computer" from your desktop or Windows Explorer, and select "Manage".
Select "Devices" in the left pane.
Locate and expand "Other device" in the right pane.
Right-click the device name (such as Nexus S) and select "Update Driver Software." This will launch the "Hardware Update Wizard".
Select "Browse my computer for driver software" and click "Next."
Click "Browse" and locate the USB driver folder. (The Google USB Driver is located in <sdk>\extras\google\usb_driver\.)
Click "Next" to install the driver.
After downloading the Google drivers via Android SDK Manager (available via Eclipse, Intellij or Android Studio), I had to update the driver in Computer Management > Device Manager > Other Devices > ADB - right clicking and clicking on update driver and browsing for updated driver finally did the trick.
BTW, a total nightmare for me as well. I continue to be bewildered that setting up a dev environment should be the most difficult task imaginable, with each new inexplicable failure leading to another one. Jeesh! Good luck.
On my Windows 8.1 64bit (Nexus 5 did not show up), only manually installing the USB driver fixed it:
http://developer.android.com/sdk/win-usb.html
The "Google USB Driver" in "Android SDK Manager" was installed already.
I still get this once in a while and it usually works if I unplug it and plug it back in a different port. I'm on Linux but had the same thing happen on Windows before.
Installing Samsung Kies and using their tool to reinstall device drivers, is what finally worked for me with my Galaxy S3 and Tab S 8.4
Normally SDB will download the driver in the **android-sdk-windows\extras\google\usb_driver** path
Here are the steps that worked for me:
Enable USB debugging.
Do to device manager, right click on ADB device and click update driver software.
Select "Browse my computer for Driver Software"
Select "Let me pick from list of Device drivers on my computer"
Click on "Have Disk" option.
Select the driver path **android-sdk-windows\extras\google\usb_driver** (path of sdk)
7.Select 1st driver out of list of drivers shown.
And hopefully, it will work.
Edit: I recommend you DO NOT run ADB under VirtualBox if you are using a Windows Host. Somehow I got VirtualBox to lock the device drivers on the host, eventually making it so that the ADB wouldn't work on the client nor the host for any device I plugged in. To fix, I removed VirtualBox extensions on the host and ran http://www.nirsoft.net/utils/usb_devices_view.html to delete the incorrect drivers. I could not get the correct drivers to load while VirtualBox extensions were installed, and this problem was a complete bastard to diagnose and fix.
Edit 2: Also the following is probably out of date, now that Google have released an integrated ADB extension for Chrome.
What an installation nightmare... Here are the steps I needed to get my Nexus 10 recognised on an XP virtual machine running under VirtualBox:
If you get asked to install Nexus 10 drivers, make sure to untick "don't ask again" (you WANT to be asked again!).
Plug in the Nexus 10 USB connection
Turn on debugging in the Nexus 10 settings Developer menu (tap "About Tablet" 7 times to get that menu).
In your virtual machine settings (host), add the samsung Nexus 10 device to the USB Device Filters (important - selecting it from the devices menu didn't seem to work).
In guest install java jre (if you don't have java installed). In Control Panel, change Java settings so that java doesn't run in the browser (to help prevent security issues).
In guest get the adk zip file and put it somewhere permanent. I needed to delete the .android config directory from the user directory because I moved the directory.
Run the SDK Manager.exe - if it doesn't work, try running sdk\tools\android.bat which seems to give better error reporting.
From SDK Manager install the Google USB driver package.
Unplug the Nexus 10 and plug it in again, and install the Google USB driver package.
Restart the guest.
running c:>[...]\sdk\platformtools> adb devices finally shows me the device...
For the Blu Studio 5.5s ADB drivers, you have to go through this hoop. I am certain it is the same with all Blu phones or maybe for all non-Google mfg phones, I am not sure. First of all if you connect the Blu device with USB cable and USB Debuggin off, you will see that Windows 7 loads a generic driver for you to copy on/off files to the phone and SD storage. This will appear when the USB cable is first plugged in and appears as a device icon under Control Panel, Device Manager, Portable Devices, BLU STUDIO 5.5 S (or the device you are working with). Do not bother getting the hardware ID yet - just observe that this happens (which indicates you are good so far and don't have a bad cable or something).
Go to the phone and switch on USB Debugging in the Developer section of your phone. Notice that an additional item appears as an undefined device now in the device manager list, it will have the yellow exclamation mark and it may have the same name of the phone listed as you saw under Portable Devices. Ignore this item for the moment. Now, without doing anything to the phone (it should be already in USB debug mode) go back to the Portable Devices in Device Manager and right-click the BLU STUDIO 5.5 S or whatever phone you are working with that is listed there without the exclamation mark (listed under Portable Devices). Right click on the icon under Portable Devices, in this example the name that appears is BLU STUDIO 5.5 S. On that icon select Properties, Details, and under the pull down, select Hardware IDs and copy down what you see.
For BLU STUDIO 5.5 S I get:
USB\VID_0BB4&PID_0C02&REV_0216&MI_00
USB\VID_0BB4&PID_0C02&MI_00
(Note if you do this out of turn, the HW ID will be different with the phone USB debugging turned off. You want to copy the value that it changes to when the USB debugging is ON)
Now do as the instructions say above, of course customizing the lines you add the the INF file with those relating to your own phone, not the Nexus 10. Here is what to customize; when you downloaded the SDK you should have a file structure expanded from the ZIP such as this:
\adt-bundle-windows-x86_64-20140321\sdk\extras\google\usb_driver
Find the file named: android_winusb.inf in the usb_driver folder
Make a copy of it and name it anything, such as myname.inf
Edit the myname.inf and add the lines as instructed above only modified for your particular phone. For example, for the BLU STUDIO 5.5 S, I added the following 2 lines as instructed in the 2 locations as instructed.
;BLU STUDIO 5.5 S
%SingleAdbInterface% = USB_Install, USB\VID_0BB4&PID_0C02&REV_0216&MI_00
%CompositeAdbInterface% = USB_Install, USB\VID_0BB4&PID_0C02&MI_00
Note that you add these lines to both the 32 and 64 bit sections, matching how the example in the tutorial reads.
Now go back up to the unknown device that appeared in Device Manager when you switched on device USB debugging and right click on this item (has yellow exclamation mark), right click on it and then select Update Driver Software, and then Browse My Computer, Let Me Pick, click on the Have Disk button and browse to find the myname.inf. Continue to agree to all the prompts warning you it might not be the right driver. As the final step, Windows should have identified the device as Android ADB Interface and once that is done, you should be able to go back, open your CMD window and run the command "adb devices" as instructed in this tutorial and now you should see that the phone is now discovered and communicating.
Now you can go have fun with the adb command.
At first Thanks #rmsyk's post.
For my issue and after long time suffering with Meizu C9 Pro witch require just android ADB drivers (no special drivers) referring to manufacturer and it solved in my Windows 7 PC by the bellow steps.
Make Sure to
Install latest version of ADB & Fastboot with the needed drivers.
Enable Developer options & USB Debugging.
Enable Media File Transfer (MTP Mode).
Manually replace C:\Users\USERNAME\.android with the folder included here ,Then kill process 'adb.exe' if found from Windows Task Manager and use adb devices and finally my device listed successfully and just confirm the PC as trusted.
Notes:
Android Studio was uninstalled in earlier time and also i tried to reinstall but was not a solution at all.
Tried adb kill-server & adb start-server but was not a solution too.
As well as the usual settings (enable USB debugging) I also had to select Enable OEM unlock in the Developer options.
This supposedly makes the device less secure, but it's your device and you know what you want to do.
Once checked the device behaved as expected and appears in the adb devices list.
You can always reverse all these settings once you're finished.
Confirm you have the correct platform SDK tools
For Windows 10, had to manually download the latest platform SDK tools from Android as the version supplied through Visual Studio 2017 EMDK for Xamarin was not sufficient. Everything else except adb.exe devices worked.
https://developer.android.com/studio/releases/platform-tools
After the platform tools were manually downloaded, device showed up regardless of USB configuration (charging, MTP, etc.)
Installing an emulator device at this stage is also helpful to see whether the problem is with adb or your physical device.
List of devices attached
12345D1234 device
emulator-5554 device
There could be two reasons why adb devices command is not working for you. Either your phones USB drivers are not installed properly or you have not enabled USB debugging mode.
I created a tool that makes installing USB drivers a one click thing.
Just connect your phone in USB debugging mode to PC.
Run my tool
It will detect and install drivers specific to your phone and also install the latest ADB & Fastboot binaries with it.
The tool is available at my GitHub Repo
It's so easy, just turn off your Android device, and then hold down both "Volume Down" key and "Power" at the same time. Wait a few seconds till it start in recovery mode, done.
Now type adb devices, and you'll see your device.
I had the same problem with my Windows 8. The Android/SDK USB driver was installed correctly, but I forgot to install the USB driver from my phone. After installing the phone USB driver ADB works fine.
I hope this will help.
Turn on debugging in the Nexus settings Developer menu (tap "About Tablet" 7 times to get that menu).
Freaking Google tricks!
Have you had an android update recently? I updated to Lollipop and all the sudden I had no adb devices. Boo! I spent awhile trying a few things to no avail. Then I went into my developer options and lo and behold, "USB debugging" had been turned off. Silly Google. After turning it back on, it immediately showed up and I'm back in business!
GoTo DeviceManager, then right click on the android device and click uninstall driver.
Unplug and plug the device back...then a pop will come on your device while your pc installs the required drivers. Click "allow" on the popup.
You can see your device when you type "adb devices" in command prompt.
For Windows, just end all the processes related to Blue stacks or any such emulator if you are using.
Worked for me.
There's obviously a ton of different problems that could be causing this (and a ton of different solutions to go along with those problems). So think about all the solutions!
If you've gotten this phone and computer pair to work together before, but they aren't working any more, it might be a specific program on your computer rather than a problem on your phone. Some programs install/use their own adb, and only one of these can connect to your phone at a time. I think this makes a race condition, so sometimes it'll connect fine.
Some programs that run adb:
HTC Sync Manager - uninstall this.
chrome://inspect - lets you view localhost on your phone. Just close the window when you're done with it.
To have ADB in MTP mode
If you don't find any ADB device (nothing with exclamation mark) in the device manager (with all developers settings on phone checked), do this:
In Device Manager :
UpdateDriver->Manuel Install->Search on my computer->Select from installed driver list -> then select the one with the word usb in it (not MTP).
Edit: after that, you'll then have 2 or 3 peripheral, one for USB and one for ADB, install adb driver using usual method (see first answers)
For my Nexus 6P downloading drivers from Google helped resolved the issue. Here is the URL with documentation. And here you can download the driver itself.
P.S. I saw some people advice to download some drivers from random places on internet. While this might help it's too dangerous in my mind to download unknown drivers from unofficial places. So the one from Google worked well for me :)

"adb devices" can't recognize my G-Tide E56

I have a G-Tide E56 running android 2.3.9
The "adb devices" command can't find my device , I've tried all the solutions I've found
for other devices but still no result, because I can't find a single answer regarding the G-Tide E56 specifically. Can any one point me to start. I'm Using a mac running OSX 10.7.4
Things I've tried:
1. check USB debugging enabled on the device
2. update adb
3. restart adb (kill-server, start-server)
The USB mass Storage is working perfectly so I'm sure there is nothing wrong with the USB port
Be sure that USB Debugging is enabled on the device
Windows Key + R -> devmgmt.msc
Find the connected device and right click
Update Driver Software
Browse...
Let me pick...
Next...
Have Disk...
%AndroidSKDLocation%/extras/google/usb_driver/android_winusb.inf
Open
See if this works, this will try and use the Android SDK Default ADB driver.
EDIT My DROID4 will only work in ADB connected mode if the USB connection is set to type MTP / Media Device, so try chaning you USB Connection modes and running adb devices while in each one.
Have you tryed going to were your adb.exe and clicking it. it will run really fast than dissapear worked once for me.Aldo another time I had to go into the task manager and kill the currently running adb
The USB drivers can be found in your sdk manager under extras

How to fix: Error device not found with ADB.exe

In cmd when I try to do the command:
adb shell
it shows device not found error. Can someone help me please. It'll be appreciated.
Don't forget to go to your device and enable Settings->Developer Options->USB debugging.
Try any of the following solutions. I get errors with adb every now and then.
And one of the following always works.
Solution 1
Open command prompt as administrator and enter
adb kill-server
adb start-server
Solution 2
Install drivers for your phone if you're not testing on emulator.
Solution 3
Open android sdk manager and install "Google USB Driver" from extras folder. (attached screenshot)
Android SDK Google USB Driver missing
Solution 4
Go to settings > Developer Options > Enable USB Debugging.
(If you don't see Developer Options, Go to Settings > About Phone > Keep tapping "Build number" until it says "You're a developer!"
Enable USB Debugging
It depends on windows system but usually:
you go to system properties
look at hardware devices
Right click on the yellow (has to be yellow if it's driver problem) icon representing your mobile device
select property
Then go on the driver tab
select update driver
choose the bottom selection find on local computer
then choose manually
From the windows opened look for driver disk the bottom right button
Choose the driver from the folder <sdk>\extras\google\usb_driver\i386 (or amd64 for and).
Remember to uncheck the show only compatible hardware.
Then choose the driver
When windows warn your about possible incompatibility go on.
For my mobile it works, but depend on your mobile if it work or not.
Hope this help, bye.
If you installed Eclipse have Android SDK, go to DDMS. If the list device display "?????????"
you do adb kill-server and then adb start-server.
Please make sure you install USB driver and enable debug mode.
Another issue here is that you likely need to turn off "connect as media device" to be able to connect with adb.
For me, I have to Revoke USB debugging authorizations in Developer Options. Here is the steps:
Turn off USB Debugging,
Revoke USB debugging authorizations,
Plug the cable back in,
Turn on USB Debugging
I solved:
Just turn off USB debugging and re-enable debugging it immediately
On my G2 I had to select PTP instead of MTP mode to get the connection to work.
I had this problem suddenly crop up in Windows 7 with my Nexus One - somehow the USB drivers had been uninstalled. I ran android-sdk/SDK Manager.exe, checked Extras/Google USB Driver and installed it. Then I unplugged the phone and plugged it back in, and ran "adb devices" to confirm the phone was attached.
This doesn't work for all phones, just the ones listed here:
http://developer.android.com/sdk/win-usb.html
Developer options
USB Debug
if you can not see developer option, go to about. build version and click build version until developer options in unlock.
Try changing USB port.
Try restarting adb server.
I have a Droid 3 (Verizon). I went to Motorola here and found the driver for the device 'Motorola ADB Interface' which was showing in device manager. It's kind of a big download for just the driver, but during installation it found it and installed correctly.
I switched to a different USB port and it suddenly got recognized...
How about:
Settings -> System -> Developer options -> Debugging -> turn on toggle for Wireless ADB debugging
or:
Revoke USB debugging authorizations
and try from the scratch.
Just wanted to provide a simple answer here. I am just messing with an old Android device for the first time doing these root and unlock procedures. I received an error like this one when an adb push "..." "/sdcard/" command failed, and the key was that my device was in the bootloader screen. Booting to recovery then allowed me copy over the file(s), and I presume the normal OS would as well.
This worked for me, my AVG anti virus was deleting my adb.exe file. If you have AVG try:
1) opening the program
2) go to options
3) go to the virus vault and click on it
4) find your adb program, click on it, and press RESTORE at the bottom
This will move the file back to its original place.
However, unless you turn off the AVG it will delete the file again.
After this android studio located the file. Good luck.
I found my solution from this similar thread by enabling USB tethering on my LG G6 (requires data saver to be turned off)
Go to: Settings -> Tethering & networks -> switch on USB tethering
For completeness, I've just had a case here I had to change my USB cable. Guess the one I had was for charging only, accursed thing.
On my Sony Xperia XZ1 Compact on Oreo I had to switch USB mode to MIDI to get it working. Only after this my Windows recognised Android ADB, however it couldn't autoinstall driver. I opened Device Manager and installed the Google USB Driver for the ADB.
To solve this problem,
Add adb folder to your windows path (system veriable)
This solves the problem
In my case I needed to swap the ends of the cable connecting my device to the computer...

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