Raw 4 MB BIOS image named ProBook 4520 C, with no file extension. The C marking is not explained, so check it against the other 4520 dumps before choosing one. The name states no motherboard number, revision or firmware version. This size matches a 32 Mbit SPI flash chip. A technician writes such a file with a programmer to recover a laptop after a failed update or a corrupted chip, after first reading and saving the original and confirming the PCB identity.
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 @biosfilebins. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →