Hi i installed google play store as i want to use Litchi, as one of the security options it wanted to be able to lock my device with a pin so done that problem is now reboot controller but no keyboard appears to put in pin! i have tried everything factory reset which i thin k is power on hold c1+c2 and shutter then turn off to no avail trying to refresh firmware it gets stuck on 11% while updating any help aprecciated