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Update from 4.1.2 to 4.2.2 fails
I have an unrooted Galaxy Nexus running 4.1.2 JZO54K and it repeatedly fails to upgrade to 4.2.2 via OTA. I have factory reset the phone and this doesn't help. It seems that there may be an intermediate version missing (4.2.0?). I have downloaded the ADT bundle but I'm at a loss to know which update.zip file to use with adb or where to get it. I don't have any previous experience with android but my phone is driving me nuts. Hope someone can help, the simpler the solution the better.