I'm in Indonesia and my Sony Z3 Compact started to face same problem since new years. I try factory reset and it did not work for me. I have already done all the process suggested but not solve the problem. Back button and Drop-down Notification are still not working. My temporary solution is ... 1. Drop-down Notification : Settings -> Display -> Screen Rotation -> - Auto-rotated screen : on - smart screen rotation : on 2. Home & Back Button : Settings -> Display -> Glove Mode (On) Note : press the button slightly below the icon Still waiting for permantent solution.
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