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, it is highly recommended to use official sources rather than third-party .rar files to avoid bricking your TV:
Power off the TV and insert the USB into a . Download RSAG7 820 5819 Hisense 55K390 part10 rar
: 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 : , it is highly recommended to use official