How can I know why my app is crashing in some devices - android

My app is running fine in the emulator, and at Nokia 6 plus mobile, but it is crashing while running at Motorola motoOne, how can I find the reason of this?

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Samsung system image for Android emulator?

Is there any way to get the Android emulator to run a system image other than vanilla Android? I'm developing an app that works fine on the emulator, a physical Huawei device and a physical Motorola device, but experiences some weird issues on a Samsung Galaxy S7.
Since I don't have physical access to a Galaxy S7, is there any way to run an emulator that actually runs the Samsung official ROM? Note that I'm not talking about an emulator skin, I'm talking about the actual system image.
While there might not be any Samsung system images to download and install on the Android Studio emulator, there is another option.
Samsung has something called Remote Test Lab, which lets you access and control a real Samsung device online. You have to join the Samsung Developers programme, and then you can use these test devices. Samsung uses a credit-based system for this, and you get 20 free credits every day, which you can then use to run test devices. Running a Galaxy S7 for 30 minutes cost me 2 credits.
This actually works surprisingly well, and only slightly more lagging than the AVD. It is even possible to get Logcat output by connecting to the device with ADB (right click on the device window for options).

Android app running on one device but not on another device

My android maps app is running on few devices like moto g4, moto g2, yu yunicorn .etc but not on the other devices like mi note 4g. I have checked the maps API and other things but the app crashes on the MI note

My app runs sooth on my android 4.2.2 phone, my android 4.2.2 tablet and crashes on Lg g2 (4.4.2)

Any idea why this is hapenning?
I don't have money to afford an 4.4.2 mobile phone and in the emulator it doesn't crash.
I don't have also the lg g2, it is from a friend of mine ( and he lives far away ). The code crashes on generating a listview on postexecute.
I'm completly lost at this one.

cannot debug on device flash builder

I have spent a lot of time to develop a game for android devices in flash builder.
It works fine on the emulator. But when I connect my Samsung Galaxy Ace Plus, which is on the certified devices list, it shows the error:
Failure [INSTALL_FAILED_INVALID_APK]
I tried to export my app and filled a valid certificate but then it says:
Application Not Installed
Just to test, then I tried an Eclipse application which worked fine. So how can I fix this?
Also installing games from the market also works fine, so technically should'nt my app work also?

Android app works on emulator but not on phone

So I've made this game for android-phones, that runs perfectly fine on my emulator. The problem is that when i try to run it on my phone, it just turns back to the in-app menu when i try to launch the game - I don't get any error messages.
Any tips on why this happens, and how I can possibly fix it.
btw. The phone I am using is HTC Desire
Update:
I tried testing it on an SIII. Here I got a crash message instead.
The android emulator, and the HTC Desire runs Android 2.2 while the SIII runs Android 4.0

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