Clean boot
Warning! You should only perform a clean boot when all other reset options have failed to restore your smartphone to an opera- tional state.
A clean boot will restore your smartphone to the state it was when you got it from the factory.
Warning! This will erase all your personal information, any contacts stored on your smartphone and any programs you installed.
If your screen is responding to stylus input: Go to Start > Utili- ties > Default Settings. Read the warning information and enter the security code in the empty textbox. Tap OK to pro- ceed.
If your screen is not responding to stylus input: Hold the Vol- ume up and Volume down buttons while pressing reset until the screen shows “Clean Boot”.