Hard Reset O2 XDA Star (HTC Niki)
- Use Power button to turn the device off.
- Next step is to press combination of keys: Power button + End button + Call button.
- Then follow up the instruction on screen.
- Now device must restart, so wait patiently.
- After restart ur device is after Factory reset and ready to work on.
Help! This doesn't work
Hard Reset will erase all of your data
All described operations you are doing at your own risk.