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Gelöst! Gehe zu Lösung.
Connect your Xperia P to a wall charger > press and hold power & volume up for 10 seconds > let it charge for 2 hours > try to turn it back on
Lösung in ursprünglichem Beitrag anzeigen
You can also repair your phone with
Update Service (SUS)
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355