How to manually update 2011 Xperias to android 4.0.4 build number 4.1.B.587 & 4.1.B.0.431
All 2011 Xperias but the Play for obvious reasons
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as always thanx XDA forum
Rooting "might" void your warranty. I'm not responsible if anything happen to your phone (nothing should go wrong,, if something do go wrong, just repeat the whole process).