With Android 7.0 Nougat there has been a change in the way system partition works on an Android device. It’s now even harder to make /system partition writable on Nougat than it was on Lollipop or Marshmallow releases of Android.

Apps like Adaway or Emoji Switcher that need to make changes to system partition on the device simple fail on Nougat even after root. But thanks to user ArminasAnarion over at xda, here’s a quick solution to fix this issue on Android 7.0 Nougat.

Your device must be rooted

  1. Download and Install Busy Box and a Terminal app from Play Store, links here: Download Busy Box  |  Download Material Terminal.
  2. Open Material Terminal app on your device.
  3. Issue the following command in terminal: 
    su
  4. Grant terminal app root access, if/when it asks.
  5. Now issue the following command to mount /system partition: 
    busybox mount -o rw,remount system

That’s it. System partition is now mounted on your Android 7.0 Nougat running device. Try running adaway or other apps that require /system partition to be writable.

Happy Androiding!

via xda