Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place.
Solved: How to reset Sony Ericsson W8 E16i hard reset
Reset only applications:
In the Menu go to Settings > Privacy. Tap Settings reset to reset your applications without changing your data or accounts.
OR Reset all data:
Tap Factory Data reset > Reset phone > Erase everything to RESET all data, Google accounts and all downloaded apps.
If nothing works: As last resort do a Sony Ericsson Walkman W8 phone repaire with PC Suite. Use this method to hard reset AFTER INSTALLATION----> TOOLS > PHONE REPAIR