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I'm using the official Sony GingerBread 2.3.7 with firmware 6.0.B.3.184 on my Xperia U and I want to use the latest 6.1.1.B.54. I've tried using Sony PC Companion/SUS but it tries to update my GB to ICS 6.1.1.B.10 which is buggy. I do not want to unlock my bootloader in this process and I also want to keep a backup of my current stock ROM in case something goes wrong. Can anyone post me a link or explain me the process of updating my phone?

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I think this is a good tutorial for you. –  user31685 Apr 5 '13 at 7:15
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