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Please read this if you considering unlocking the boot loader or rooting your phone.
Please note that you may void the warranty of your phone and/or any warranty from your operator if you unlock the boot loader. You should only unlock the boot loader of your phone if you are an advanced user with good knowledge of the technology and risks involved.
For more information go here http://unlockbootloader.sonymobile.com/
Please also note
The Sony Xperia support team will not be able provide any support, related to unlocking the boot loader or rooting your phone.
We also recommend you to read the below blogposts.
Sony Xperia support team
2013-02-03 09:19 AM
Hi there, how can I root my Xperia U with Android 2.3.7 and build 6.0.B.3.188? I want to root for backup my firmware and then upgrade manually to ICS.
Please help me
2013-02-03 11:56 AM
2013-02-03 09:42 AM
so i follow this method, right? http://www.youtube.com/watch?feature=player_embedded&v=SuaXu8kusvA#! is one of these
and i think is the simplest way
2013-02-03 09:49 AM
2013-02-03 10:41 AM
one more question. can i use the function backup rom of this app? https://play.google.com/store/apps/details?id=com.koushikdutta.rommanager&hl=ro
i want to backup my entire gb firmware.
2013-02-03 11:33 AM
2013-02-03 11:41 AM
but there is only 3 options:
-normal (for phones)
-special (for tablets)
and btw, i don't have Sony's Backup&Restore. and i can't found it for my GB.