Hello ManoftheSea Thank you for your feedback.
I could flash an old image without any problems, but unfortunately that doesn't do me any good, since the kernel modules for the DVB Media Adapter PCI are not included in the images by default. That's why I always build the OS completely and check the kernel modules DVB for PCI.
Updated u-boot (2022.04) needs new default boot environment and new boot script (TODO with 2022.05 release)
U-boot Script 404 Not Found