Please note that the Firmware is read by programmer RT809H wich at the moment with its latest software version 20250423 can only detect WT61P8 that is 64KB instead of WT61P8S, as the chip on the Mainboard, that actally have 32KB. Despite this Firmware size difference the programmer RT809H will read and write correctly the chip when chosing WT61P8 on Auto ISP Menu connected troght VGA port on TV and programmer and with TV plugged to mains. After programming you need to disconect and reconect to mains.
Might fix issue like no Power ON at all, cycling Power On etc.