Firmware archive for an ASUS-style UX325 series main board, listed under the models UX325 and UX425EA, with board marking NB2555_PCB_MB_V4. The ZIP of about 7.4 MB likely holds a BIOS image for the SPI flash. Before writing, read and save the original chip contents with a programmer, compare the dump size with the flash capacity, and check that the V4 board marking printed on the PCB matches. Serial and network identifiers from the original dump may need transferring.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →