Ok, after 10 minutes of intensive research, I found a solution that's working for me. 1. Download & install adb-tools (apt-get under ubuntu) 2. Set your phone in developper mode (multi tap on build number in the about the phone in the settings) and allow USB debugging in the developpers options. 3. Connect a usb cable between the phone and the PC, and accept the PC fingerprint on the phone 4. Launch the shell (or command line) on the PC then type these magic words : adb shell wm overscan 0,10,0,0 10 is the number of the top dead pixels. 10 is working like a charm for me but you can test larger values. Change it as you wish. Of course you'll lose 10 pixels of display but the notification bar will work again after. Regards.
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