Using software like AsProgrammer or NeoProgrammer , erase the chip, write the firmware, and verify. This is not for beginners. If you lack experience, contact a professional electronics repair service.
The firmware’s GPIO mapping changed between versions. Tp.sk706s.pc822 Firmware
While I can provide the context and "story" of the board, firmware files are often hosted on specialized technician sites. If you are looking for a download, you might check: Using software like AsProgrammer or NeoProgrammer , erase
, which provides modern app compatibility and a smoother interface compared to older TV boards. Amazon.com Key Features of TP.SK706S.PC822 Firmware Using software like AsProgrammer or NeoProgrammer