This is the specific TV model number (55-inch N770 series).
What is the TV having? (No power, stuck on logo, etc.) Do you have a USB drive or a hardware programmer ? Download MS3458 PC757 3840x2160 JVC 55N770 Dump rar
This confirms the firmware is for a 4K Ultra HD display. This is the specific TV model number (55-inch N770 series)
Technicians use this file when a TV is "soft-bricked." Common symptoms include: The TV is stuck on the . The screen stays black even though the power light is on. The TV restarts in a loop ( Bootlooping ). This confirms the firmware is for a 4K Ultra HD display
If you install firmware meant for a different panel (even if it's the same TV model), you can physically damage the screen or end up with an upside-down or solarized image.
Have you already tried a using the physical buttons?
Files found on random forums can contain malware. Always use trusted technician communities. If you are trying to fix a TV, tell me: