Second copy of a 4.00 MB BIOS image for the 4420s model designation, marked with a duplicate suffix in its name. It may be identical to the other 4420s file or a separate dump taken from another unit, so compare checksums or open both in a hex editor before choosing one. No board number, revision or version is given. Flash it to the SPI chip with a programmer only after backing up the existing contents and confirming the 4 MB chip size and board number match your machine.
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 →