I will try to do it. I will select the 2020.1 for reinstalling via SD Card.
Thanks for now
Btw: I tried to downgrade the kernel and got “failed to initialize EGL display (EGL error 12291)”. Because i previously had tried to switch to the new “videoimprovevero” channel ([TESTING] Linux 4.9 kernel and improved video stack for Vero 4K / 4K +). But it didn’t fix my problem…