Even with the same mainboard, different screens (Samsung, LG, BOE) require different panel software. Check the sticker on the back of the LCD panel itself.
If you purchased the TV from a specific retailer, their service department often has access to the official firmware repository for that brand.
If you can tell me the of your Noa Vision TV or the Panel Number found inside, I can help you search for a more specific download link.
If you obtain the file, the standard process for MSD6586 boards is: Extract the .rar file to get the .bin or .img file. Format a USB drive (8GB or smaller) to . Copy the firmware file to the root of the drive.
Unplug the TV, insert the USB, then plug it back in while holding the button on the TV until the "Upgrading" screen appears.