@rinigus The compass seems to be quite reliable on XZ3, at least after quick calibration in one of the two compass apps I tried.

On boot after flashing img it goes:
SONY logo
white led on SONY logo
white led turns off stays on the SONY logo,
so no white dimmed light and no blank screen.
Seems to confirm the previous report.

What should I now try in order to get more info for you?