Hard Reset O2 XDA Guide (HTC Iolite)
- Power button to switch off your device.
- Next step is to hold the Volume Down + Power button + Enter button.
- Confirm whole reset by tapping Volume Up, any other key to cancel it.
- Success! you can now work on your device.
Help! This doesn't work
Hard Reset will erase all of your data
All described operations you are doing at your own risk.