If you provide the actual firmware binary, boot logs, or the device model, I can give a more specific analysis (extraction commands, dtb/kernel versions to look for, and targeted recovery steps).
: Wait for the progress bar to reach 100%. The receiver will reboot automatically. Warning: Turning off the device during this process will destroy the flash memory. Dvbs-1506tv-v1.0-otp-s0 Software
Indicates the Sunplus 1506TV processor, known for its efficiency in handling HEVC/H.265 and standard HD signals. If you provide the actual firmware binary, boot