Power off the TV and insert the USB into a .
The file likely contains a portion of the firmware for the RSAG7.820.5819 main board , which is used in the Hisense 55K390 Download RSAG7 820 5819 Hisense 55K390 part10 rar
: If the firmware isn't listed online, you can email Hisense support with your model and serial number. They often provide a link to the specific .pkg or .bin file required for your board. Manual Installation Steps Power off the TV and insert the USB into a
, it is highly recommended to use official sources rather than third-party .rar files to avoid bricking your TV: Manual Installation Steps , it is highly recommended
Wait for the process to complete (usually 5-15 minutes). The TV will reboot automatically.
: Never turn off the power during a firmware update, as this can permanently damage the main board.
: 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 .