List of bugs fixed / changes:
The first release version of Android 7.1.
How to unroot?
1. Please go to: Settings -> More Settings -> About MediaBox
2. Press "Build number" 6 times to enable developer mode.
4. Go to "Root permission" and then you can disable it to unroot it!
5. Press ok to reboot and the device will be unrooted.
Cautions: It will erase all your data / installed apps. We strongly recommend you to do the backup before doing this update!