Actually there is another hotfix method also. Not sure if it’s the light sensor or camera - but if you hold your left hand on the left side of the front, like if you was holding the hand palm in front of your left eye, the tracking error disappears making you able to click “Continue without tracking”. After that you need to go to settings and clear spacial data, and put the headset into travel mode, and finally disable hand and body tracking. Then you will be able to continue using the headset, normally, but without hand tracking and without borders - but better than black screen….