Downloadable archives for this specific main board and TV model are primarily hosted on community-driven platforms:
Insert the USB into the TV's USB port while it is turned off. Download VST56 PA671 Saturn LED22FHD400U rar
Updating TV firmware manually usually involves using a USB drive formatted to FAT32. While specific steps vary by manufacturer, the general procedure outlined by technicians on YouTube includes: Extract the .rar file to get the .bin firmware file. Downloadable archives for this specific main board and
Copy the .bin file to the root directory of a clean USB flash drive. Download VST56 PA671 Saturn LED22FHD400U rar