For info
adb remount
returns "remount failed: Operation not permitted"
adb shell 'su -c mount -o rw,remount /system'
returns unknown option -- o
My device is rooted.
Probable cause that remount fails is you are not running adb as root.
Shell Script should be as follow.
# Script to mount Android Device as read/write.
# List the Devices.
adb devices;
# Run adb as root (Needs root access).
adb root;
# Since you're running as root su is not required
adb shell mount -o rw,remount /;
If this fails, you could try the below:
# List the Devices.
adb devices;
# Run adb as root
adb root;
adb remount;
adb shell su -c "mount -o rw,remount /";
To find which user you are:
$ adb shell whoami
I could not get the mount command to work without specifying the dev block to mount as /system
#cat /proc/mounts returns ( only the system line here )
/dev/stl12 /system rfs ro,relatime,vfat,log_off,check=no,gid/uid/rwx,iocharset=utf8 0 0
so my working command is
mount -o rw,remount -t rfs /dev/stl12 /system
Otherwise... if
getenforce
returns
Enforcing
Then maybe you should call
setenforce 0
mount -o rw,remount /system
setenforce 1
The following may help (study the impacts of disable-verity first):
adb root
adb disable-verity
adb reboot
I had the same problem and could not mount system as read/write. It would return
Usage: mount [-r] [-w] [-o options] [-t type]
device directory
Or
operation not permitted. Access denied
Now this works on all rooted devices.
DO THE FOLLOWING IN TERMINAL EMULATOR OR IN ADB SHELL
$ su
#mount - o rw,remount -t yaffs2 /system
Yaffs2 is the type of system partition. Replace it by the type of your system partition as obtained from executing the following
#cat /proc/mounts
Then check where /system is appearing from the lengthy result
Extract of mine was like
mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0
none /dev/cpuctl cgroup rw,relatime,cpu 0 0/dev/block/platform/msm_sdcc.3/by-num/p10 /system ext4 ro,relatime,data=ordered 0 0
/dev/block/platform/msm_sdcc.3/by-num/p11 /cache ext4 rw,nosuid,nodev,relatime,data=ordered 0 0
So my system is ext4. And my command was
$ su
#mount -o rw,remount -t ext4 /system
Done.
Get "adbd insecure" from google play store, it helps give write access to custom roms that have it secured my the manufacturers.
In addition to all the other answers you received, I want to explain the unknown option -- o error: Your command was
$ adb shell 'su -c mount -o rw,remount /system'
which calls su through adb. You properly quoted the whole su command in order to pass it as one argument to adb shell. However, su -c <cmd> also needs you to quote the command with arguments it shall pass to the shell's -c option. (YMMV depending on su variants.) Therefore, you might want to try
$ adb shell 'su -c "mount -o rw,remount /system"'
(and potentially add the actual device listed in the output of mount | grep system before the /system arg – see the other answers.)
mount -o rw,remount $(mount | grep /dev/root | awk '{print $3}')
this does the job for me, and should work for any android version.
I want to change my android emulator sdcard read only permission, for that I typed
mount -o remount,rw /mnt/sdcard
in adb shell. But it shows
Usage: mount [-r] [-w] [-o options] [-t type] device directory
Whats the problem in the command I have written in the adb shell.
I think you must write something like this:
mount -o remount rw /sdcard
How to root Android 4.1.2 is, as I said in the title?
adb shell mount -o rw,remount -t yaffs2 /dev/block/mtdblock03 /system
adb push su /system/xbin/su
adb shell chmod 06755 /system
adb shell chmod 06755 /system/xbin/su
this code works Android 2 but doesn't work on 4.1.2.
Change and Try using the following line:
adb shell mount -o rw,remount -t yaffs2 /dev/block/mtdblock0 /system
i have put this command but facing this problem
Operation not permitted
adb shell mount -o remount,rw -t yaffs2 /dev/block/mtdblock0 /system
and this error is shown
Operation not permitted
You have to be a root to remount /system.
Check is this true by id command.
I guess you have only permissions of user-shell
add
If you are really root - you may try adb remount command. This command is exactly what you are looking for.
What I found worked for me on a rooted device
adb shell
su
abd mount -o remount,rw {whatever options you want}
su didn't ask for a password
If you have rooted phone then go to terminal and hit the below command to get all access
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
This helped me
i need to reboot my android emulator from adb shell
preetam#ubuntu:~/android-sdk-linux_x86/tools$ ./adb shell
# su
# mount -o remount,rw -t yaffs2 /dev/block/mtdblock4 /system
# reboot
i tried this commands, but they didn't work. Is there any other way to reboot the emulator?