Dear all, I do not know if its in the right context, but OH3 may have issues with a AntiVirus Software. I just freshly installed OH3 and set up Rasp PI4 with Aeotec Stick 5 plus (works fine 
) but my Fibaro Plug was only able to switch on (not off !). I remembered from a AVM Fritzbox issue to this link. Putting OH3 adress to the black list resolved my updating problem.
Link: (No Data visible in Widgets /Pages - #3 by eloka080677)