Help! This doesn't work.
Force Restart O2 XDA (HTC Wallaby)
Start by opening back of handset.
Remove battery and wait 5 to 10 seconds.
Then shove battery back again in device.
Press the Power button and wait for device to startup.
From this moment phone should restart and will be ready to use.
Force Restart (O2 XDA (HTC Wallaby))