Homatics Box R 4K Plus

Mine bricked itself on Android14 upgrade, I had to manually reflash firmware image.

Now with v14.8.7475 it’s not booting Coreelec anymore, already tried 3 different USB sticks, the reboot to corellec app, usb host disabled, long press reset etc. always ends in a boot loop with homematics logo ?

edit: latest 22.0 works