Duplicate-named copy of the PLF PLR CSF CSR DSC MB revision 2.1 BIOS package, with the same size as the matching file. It is likely identical, but comparing checksums of the extracted images would confirm it. The firmware targets the discrete-graphics version of this board, used in several Acer notebooks, and is meant for programmer-based SPI flash recovery. Check the PCB revision and graphics type, back up the existing dump before erasing, and make sure the image size matches the chip.
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 @afsbiosfree. 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 →