Plug into a pc/laptpp, power off the device, press and hold the Volume Up and Power buttons, release them when the Android logo appears, and use the Volume keys to navigate to "Wipe cache partition" and confirm with the Power button
Beta ? If so then you should provide report on the usual beta channels.
Smiley
------------------------------------------------------------------------ User: Smiley If my reply has been useful in resolving your issues, then please like and 'mark as solution'. - My life is full of positives and negatives. I’m an electrical engineer. ------------------------------------------------------------------------