A BIOS dump for a Dell model numbered 3420, presumably an Inspiron or Latitude 3420, since the name gives no series. The 8 MB binary matches a 64 Mbit SPI flash. Such an image is written with an external programmer to revive a board with corrupted firmware. Model numbers like this can be shared by different generations, so compare the board number printed on the PCB before writing. Read and save the existing chip contents first, as they hold the unit-specific data.
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 →