Power off the TV, insert the USB, then hold the physical Power button while plugging in the power cord. The LED will blink rapidly until the update is complete.
Here is a structured, "good post" reply covering the essentials for this board. tp.vst59.p67 software
Not all USB ports on the board support flashing. Try the second USB port. Also, ensure the USB drive is not USB 3.0 (use USB 2.0), and format it as FAT32 with 4096 byte sectors. Power off the TV, insert the USB, then
Updating this board is straightforward and doesn't require an ISP programmer like the RT809F, provided the board still recognizes USB inputs. Step 1: Preparation Find a (formatted to FAT32). Power off the TV