: Never turn off the power during a firmware update, as this can permanently damage the main board.
Hold the on the remote while plugging the TV back in. Continue holding until the "Software Updating" message appears. Download RSAG7 820 5819 Hisense 55K390 part10 rar
, it is highly recommended to use official sources rather than third-party .rar files to avoid bricking your TV: : Never turn off the power during a
: 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
Power off the TV and insert the USB into a .