Duplicate BIOS image for the 6540b, 4.00 MB binary, saved as a numbered copy with no explanation of how it differs from the first. Comparing the two in a hex editor reveals whether they are identical reads or separate dumps. To use it, connect a programmer to the 32 Mbit SPI chip, save the current contents, erase and write the image, then verify. Make sure the laptop and its board are really a 6540b before flashing, as firmware from another model will not work.
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.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →