MOPIK: hele tak na foru wmmania.cz doporucujou v tehle situaci zazalohovat telefon a udelat hard reset.
Performing a factory reset using phone buttons
Turn the power off.
Press and hold the VOLUME DOWN button, and then briefly press the POWER button. Release the VOLUME DOWN button when you see an icon on the screen.
Then press the following hardware buttons in sequence: VOLUME UP > VOLUME DOWN > POWER > VOLUME DOWN.