: Never turn off the power during a firmware update, as this can permanently damage the main board.
: Format a USB stick to FAT32 . Copy the extracted firmware file directly to the root of the drive (do not put it in a folder). Initiate Update : Download RSAG7 820 5819 Hisense 55K390 part10 rar
: Use a tool like WinRAR or 7-Zip to extract "part1.rar." This will automatically combine all parts (including part10) into a single upgrade file, typically named something like upgrade_loader.pkg . : Never turn off the power during a