Solved: How to reset Sony Ericsson Xperia X10:  With the phone turned off, press both LEFT and RIGHT buttons +...

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.

 

Sony Ericsson Xperia X10 hard reset

Resetting Sony Ericsson Xperia X10 phone

1st try xperia x10 hard reset with key combo

With the phone turned off, press both LEFT and RIGHT buttons on the front and POWER ON the X10 to HARD RESET.

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----> TOOLS > PHONE REPAIR

Sony Ericsson Xperia X10 phone repaire pc suite tools

http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/pcsuite/aino?cc=gb&lc=en

 

Sony Ericsson Xperia X10 phone repaire pc suite tools

Sony Ericsson Xperia X10 phone repaire pc suite tools

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

With the phone turned off, press both LEFT and RIGHT buttons on the front and POWER ON the X10 to HARD RESET.


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.

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.