: CH341A (budget-friendly) or RT809F / Asurada (professional).
If the laptop is completely dead, you must acquire a verified working "dump" (a read-out copy of a working chip from another identical motherboard). dell latitude 3420 bios bin file
a corrupted chip using a programmer (like a CH341A), or you're trying to the raw BIOS from a standard Dell update file The laptop may cycle on and off 2 or 3 times
Expect a delay of 1 to 3 minutes. The laptop may cycle on and off 2 or 3 times. This is normal behavior as the Intel Management Engine initializes. A technician replaces the physical BIOS chip or
The laptop turns on, the fan spins, but the screen stays entirely black with no logo.
A technician replaces the physical BIOS chip or fixes power-rail issues requiring a clean firmware injection. Technical Specifications of the Latitude 3420 BIOS