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I can't find the notification light settings and I want to be notified when I receive a message or a call
do you have Extended stanby mode on?
settings > batter/power management
no it's not enabled
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