Firmware archive with an uninformative name, RT2871P838, and no brand or model stated. At 455 MB it is far larger than a typical PC BIOS and is more likely a TV main board software package or memory dump. RT2871 and P838 resemble markings used on some Realtek-based television mainboards, but the name does not confirm this. Open the RAR to check its contents and any readme before use. Match the board code on your unit and back up the existing eMMC or flash before writing.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @tvcodeservice. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →