Acer firmware package labelled only with the model token P453, supplied as a RAR archive of 4.49 MB. The name gives no board number, revision or flash size, so open the archive and check what images it holds before use. Typically such packages contain a BIOS dump meant to be written to the SPI flash with a programmer such as a CH341A. Confirm the model and motherboard number printed on the PCB match, read and save the original chip contents first, and make sure the image size equals the chip capacity.
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 @biosbigarchives. 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 →