If you have the full extracted firmware, follow these steps to update your board:

Format a USB flash drive (8GB or less is recommended) to FAT32 .

When dealing with the smart motherboard—especially for a specific 1366x768 panel using Samsung IR codes—finding the correct firmware is crucial for restoring your TV's functionality. This particular "part3.rar" file is typically one segment of a multi-part compressed archive containing the full eMMC dump or USB update software. Board Specifications & Identification