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Hi, I have a rooted Sony Ericsson Xperia Active with the android version 2.3.4 and I want to update it to android 4 and in order to root it I downgraded the firmwarefrom 4.0.2.A.0.62 to 4.0.2.A.0.42 and then rooted using a toolkit. Now to upgrade to Android 4 how do I do it? Is it safe? Do I...