Ensure you are using the firmware that matches your TV's panel resolution to avoid display issues. Complete TP HV553 PC821 Software Setup Instructions

Unzip the .rar file to find the binary firmware file (usually named allupgrade_553_sos.bin or similar).

Smart TV, you can find the necessary .rar files through specialized LED/LCD TV software repositories and community forums. This specific motherboard ( TP.HV553.PC821

Copy the file directly to the root of a FAT32-formatted USB drive. Flash Firmware:

Insert the USB into the TV's USB port while the TV is unplugged.

Press and hold the button on the TV (not the remote) and plug the TV into the power outlet.

Provides order links for various universal LED TV board softwares. Installation Instructions