The laptop powers on (LEDs light up), but nothing appears on the display.

If you need a pure .bin for an external programmer (like the CH341A), you can sometimes extract it from the official Dell installer: Dell Latitude 3420/3520 System BIOS | Driver Details

The BIOS (Basic Input/Output System) for the Latitude 3420 is stored on a . It manages critical low-level functions such as hardware initialization and security patches for Intel vulnerabilities. Common Symptoms of BIOS Corruption