this is no question and no tutorial. I just want to avoid someone else searches for this (as I did) and then hurts himself with a huge face-palm (as I did). I put this topic under beginner - as this does not deserve to be somewhere else.
If you used openhabian-config for a system-upgrade, and ignored any warnings regarding Java 11 - you might end up with some older bindings not working (as eg. fritzbox tr064).
Here the thing I missed for two hours: “You can downgrade java within openhabian-config in “OpenHAB Related””
… And second thing I missed for 10 minutes:
“Read the warning before you hit enter… the standard selection is not to install.”
This will only work if you are still on OpenHAB2 (OpenHAB3 needs Java11).
Perhaps this will help someone in my situation (early in the morning w/o coffee)
Seems like a rough day for you
But don’t worry, we all have been there! I had a hard time waiting for the dd backup image creation of my openhab SSD (20hrs) and was almost considering stopping it so I can try out OH3 right away…
Now I’ll start migrating tomorrow morning…