Solved: How to reset Sony Ericsson Xperia X10 phone: From the Home screen, tap the applications bar. Tap Settings > SD card & phone storage...
If you experience problems with your phone, check these tips before you try anything else:
Restart your phone.
Remove and re-insert the battery and SIM card. Then restart your phone.
Resetting Sony Ericsson Xperia X10 phone
Resetting the phone deletes all data, including downloaded applications, and resets the
phone back to its initial state, the state before you turned on the phone for the first time.
Make sure to back up important data you have on the phone before you reset the phone.
Resetting Sony Ericsson Xperia X10 phone
Sony Ericsson Xperia X10 PC Suite USE THIS METHOD FOR 100% Xperia X10 hard reset AFTER INSTALLATION----> TOOLS > PHONE REPAIRE
http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/pcsuite/aino?cc=gb&lc=en
Resetting Sony Ericsson Xperia X10 phone
1st try xperia x10 hard reset with key combo below pls scroll down.
If nothing works: As last resort do a Sony Ericsson Xperia X10 phone repaire with PC Suite. USE THIS METHOD FOR 100% Xperia X10 hard reset AFTER INSTALLATION select----> TOOLS > PHONE REPAIR
http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/pcsuite/aino?cc=gb&lc=en
To reset the X10 phone
1 From the Home screen, tap the applications bar.
2 Tap Settings > SD card & phone storage > Factory data reset > Reset phone.
3 Enter your screen unlock pattern.
4 Tap Erase everything.