Do not turn off the power during this process. The TV will usually restart automatically once finished. Official Support & Troubleshooting
Installing the wrong firmware version can "brick" your TV (make it permanently unbootable). Always verify that your board number matches TP.MT5510I.PB801 exactly before flashing. Download MT5510I PB801 1366X768 JVC REF30 part09 rar
Plug the TV back in. Some models require you to hold the button on the TV panel until the standby light starts flashing rapidly, indicating the update has started. Do not turn off the power during this process
Did you need the for these specific RAR parts, or were you looking for a technical schematic for this board? Software Updates - JVC Support Download MT5510I PB801 1366X768 JVC REF30 part09 rar
Check the JVC Global Support Page for the most recent official firmware updates.