Firmware archive for a Positivo computer with board code POS-PQ45AU, labelled revision 1.07, though whether that refers to the PCB or the BIOS version is not clear from the name. The 1.81 MB RAR should hold an image for the BIOS chip. Positivo is a Brazilian brand whose machines are often built on boards from various ODMs, so compare the motherboard marking carefully. Use an SPI programmer, keep a backup of the original contents, and make sure the image size fits the chip 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 @biosarchive. 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 →