Since these boards are used by various manufacturers, there is no single "official" repository.
Visit the Hisense or Toshiba support site for your region and enter your TV model number. rsag7820 firmware upd
The term "RSAG7.820" is a generic PCB (Printed Circuit Board) identifier, but there are several variations (e.g., ). Before searching for firmware, you must confirm: Since these boards are used by various manufacturers,
The TV displays the brand logo and then restarts indefinitely. but there are several variations (e.g.
