Just a quick post for my own reference later, though hopefully it is useful to others. Many new phones have a super partition and the way they are designed makes it difficult to remount the system partition as read and writable. I didn’t come up with this, but it took me hours to find online, so I am posting it here, with full credits to the original author. I particular, they were using this to be able to install a system privileged app, but this works to make it r/w for any purpose.
Here’s the code:
$ adb root
$ adb shell avbctl disable-verification
Successfully disabled verification. Reboot the device for changes to take effect.
$ adb disable-verity
using overlayfs
Successfully disabled verity
Now reboot your device for settings to take effect
$ adb reboot
$ adb root && adb remount
remount succeeded
$ adb push ScreenCap.apk /system/app/
ScreenCap.apk: 1 file pushed. 33.1 MB/s (1640812 bytes in 0.047s)
$ adb reboot
And here’s the credit:
https://android.stackexchange.com/questions/220370/how-to-modify-system-priv-app-in-android-10
Originally written by Libin Jose
https://android.stackexchange.com/users/326624/libin-jose
Linux – keep it simple.