So this happened with me another time, and again due to same stuff, I updated my Mx player which was in system/app so I decided to integrate its updated apk to System/app then it started showing "Unfortunately Mx Player have stoppee working" I do this all the time but only Mx player is the one which gave me so much trouble, I renamed it to its package name "com.mxtech.videoplayer.ad.apk" and also set rhe permissions to "-rw-r--r--" and that's where I think I did wrong... And I don't know what came over me and I restarted my phoen and its atuck on the black screen after Sony logo so before I fixed it by flashing and wipe my data. But now I have a lot of data that I didn't have backed up.. Soo can please anyone tell me how can I remove that. Apk from System/app so I that I don't lose my data... AND I'M DAMN SURE IT IS CAUSED BY THAT APK.. Thanks in advance...
Looks like you have root privilege. Try these form cmd prompt:-
adb root
adb remount
adb uninstall <package_name>
adb shell sync
adb reboot
Another trick is to access the APK folder in /system/app:-
adb root
adb remount
adb shell
#cd /system/app
# ls // try to rm -rf the apk folder from here
#exit
adb shell sync
adb reboot