System RW Protection
Some manufacturers are now implementing /system protection which reboots the device when an app tries to write to the /system partition.
Android Tuner is able to detect such protection and will cause a reboot during detection. After the reboot, Android Tuner will no longer modify the /system partition. This will cause any features depending on this to fail (such as moving app to system, uninstalling system apps, etc...).
If you believe the detection mechanism wrongly detected such problem, please delete file /data/data/ccc71.at/prevent_rw_system (or /data/data/ccc71.at.free/prevent_rw_system) to let Android Tuner modify /system partition. However if another reboot occurs because of that, Android Tuner will stop writing to /system partition again.
If Android continues to wrongly detect /system protection, please send a Support Request from Help and Support (in easy main screen or settings).