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Is 4.0.2.A.62 still offered Over The Air for us rooting-fans now that ICS has been released?
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Yes it's still offered
You may face problem if you modify your firmware ( Root, flashing different firmwares etc )
did you unlocked the bootloader? if you did it's not going to work
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Lol, did you flashed any other firmware?
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No, not yet. I am considering to downgrade to 2.3.4 again since ICS feels slower. But since i don't want to flash and reflash again i was hoping that a Sony official could enlighten me before i molest my phones firmware. 
you could create a backup of your current firmware and then flash away, but as of right now there isn't an official statement as to if the 2011 Xperias will get any further updates
http://talk.sonymobile.com/thread/38251
if you want to downgrade, or backup your firmware or debrand
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