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if you still have Sony's firmware either repair your phone with SUS or PCC
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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
for future reference
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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if you have a cutom ROM you need to flash your phone
How to manually update, downgrade, root 2012 Xperias
http://talk.sonymobile.com/thread/41609
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No. i didn't have custom Rom
i just root my mobile and want to reset the original Rom agine to remove root
ok, use SUS or PCC (link above) or flashtool either or will work
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