To perform Xperia Ray hard reset
Resetting the Xperia Ray phone ST18i
You can reset your phone to its original settings, with or without deleting all of your personal data. It is possible to reset the phone to the state it was in before you first turned it on. But before you perform a reset, make sure to back up any important data saved on your phone.
To reset the phone
press the Menu key
scroll to and select Privacy
select Factory Data Reset
select Reset Phone
select Erase Everything
the phone will then restart to complete the reset
A hard reset will reset your phone to factory default settings. All files and configurations that you have entered in the phone will be lost. After the hard reset the phone will reinstall Windows Mobile and the software included.
Note: Backup the files that you want to keep, before you perform a hard reset. You can backup files via a computer or a memory card.
firmware update with PC companion softwareDownload PC companion and install
Install PC companion on your PC computer. Follow instruction. For firmware update you need a micro USB cable. When the pc recognizing your XPERIA Ray it will install the necessary driver files.
After your XPERIA Ray connected press Start / in Support Zone
You can also use Sony Ericsson update service tool
PC Suite is out of date use PC companion software instead
If nothing works: As last resort do a Sony Ericsson Ray phone repaire with PC Suite. Use this method to hard reset AFTER INSTALLATION----> TOOLS > PHONE REPAIR