adb remount permission denied, but able to access super user in shell -- android
In case anyone has the same problem in the future:
$ adb shell$ su# mount -o rw,remount /systemBoth adb remount and adb root don't work on a production build without altering ro.secure, but you can still remount /system by opening a shell, asking for root permissions and typing the mount command.
emulator -writable-system
For people using an Emulator: Another possibility is that you need to start the emulator with -writable-system. That was the only thing that worked for me when using the standard emulator packaged with android studio with a 4.1 image. Check here: https://stackoverflow.com/a/41332316/4962858
Try
adb rootadb remountto start the adb demon as root and ensure partitions are mounted in read-write mode (the essential part is adb root). After pushing, revoke root permissions again using:
adb unroot