Cannot install any addons after upgrading to 2019.04-1

This is incorrect. Never do this unless absolutely necessary. You should first ensure that the GUI is set to 1080p. If there is still overscan present, use the TV’s settings to change the wide mode/aspect ratio/overscan settings (different manufacturer have different names) to 1:1 or just or whatever setting provides full screen output.

Using Kodi calibration will diminish video quality and should only be a last resort.

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