Share your experience!
Hello,
Whenever i restart my phone it shows checking for error.....it flashed only for 10 sec then working fine,
Now i want to ask you is there any problem....
Repair your phone with SUS or PCC
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Don't forget to give Kudos
still getting error msg 
Do you have any microSD card in the phone? If so, try removing that and see if the problem remains.