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
Wait for the process to complete (usually 5-15 minutes). The TV will reboot automatically. Power off the TV and insert the USB into a