The specific file you are looking for, , is frequently hosted on electronics repair forums and community technical sites:
Insert the USB drive into the TV's USB port while the power is off. Download RD8503 General 1920x1080 USB rar
To set a custom boot logo, place a photo on the USB drive, select it in the media player, and use the Capture Logo option in the service menu. The specific file you are looking for, ,
Similar software can be found on sites like Softwarezone.ga or dedicated Facebook groups like China LED-LCD Tv Bios Bin . USB Installation Procedure select it in the media player