Share your experience!
How to check?I'm kinda worried if i got the non-genuine set of Xperia SP since it got a lot of lag.
Most likely it is original, repair your phone with
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 the Kudos