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2012-09-18 03:47 PM
Sony Update Service
try to repair your software, but be aware that it will erase your personal data, so make a backup.
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2012-09-18 03:52 PM
I dont think it is a software problem cozz sometimes I hit the back of the phonee and the vibration is back but it just goes off after sometime
2012-09-18 03:58 PM
then that might be a case of hardware fault, dial *#*#7378423#*#* service test, vibrator and check if its working there, if not then may be it needs to be serviced