O2 xda stealth hard reset procedure
First of all switched offf this cell u can remove its battery & put it again then wait for a 10second then do this magic
{left button in centre jog dial + right button in centre jog dial + Power Switch} & wait for a minute u ill see on screen formating at this time press Green Button thats is call button & this ill hard reset your O2 xda stealth
If Not work, Press and hold 2 button : Windows & OK (Under green and red button), press reset button.
it will do magic