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Dell support refused to help because the units were stolen (allegedly lost inventory – a common liquidation issue).

Download verified firmware directly from the Dell Support Site to fix known bugs and security flaws like CVE-2022-46752.

Finding or creating a "patched" BIOS .bin file for the Dell Latitude 3420 is a specialized task typically used for repairing a corrupted BIOS chip or removing a forgotten administrator password. Patching and Recovering the BIOS

Due to copyright (BIOS contains Intel copyrighted ME firmware), I cannot host the file here. However, search for: