HISENSE 65H6510G (13 AUGUST 2020)

When powered on, initial splash screen (HISENSE ANDROID TV) displays for a few seconds then power shuts off. Tried updating firmware with USB flash drive (can't find 4GB drive but did format larger drive in FAT32) with no luck. Flash drive would be accessed but would never get to the update process. I have ordered a board (RSAG7.820.7911/ROH, PART# 242585) from eBay which will arrive in a few days. Does anyone have any input of whether I am chasing down the right trail or should I be trying something else? I appreciate your time and wish to say thank...