Insert the USB drive into the TV's USB port while the power is off.
Similar software can be found on sites like Softwarezone.ga or dedicated Facebook groups like China LED-LCD Tv Bios Bin . USB Installation Procedure Download RD8503 General 1920x1080 USB rar
Press Menu + 1147 on the remote to access advanced settings like panel resolution, LVDS mapping, or mirror mode. Insert the USB drive into the TV's USB
Wait until the flashing stops or slows down (usually about 1 minute). Power off the board and remove the USB drive. Download RD8503 General 1920x1080 USB rar