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- Dell Optiplex GX520 620BIOS · 512 KB · 10 May 2025BIOS bin—512 KB
- Dell Optiplex GX520 620 (Luirons Bios)BIOS · 325 KB · 23 Feb 2021BIOS rar—325 KB
- Dell Optiplex GX520 620 telegram BIOS Repair-2025-09-16BIOS · 479 KB · 20 Sept 2025BIOS zip—479 KB
- Dell Optiplex GX520 620
Firmware archive for the Dell OptiPlex GX520 and GX620 business desktops, with no board number, revision or version given in the name.
BIOS · 344 KB · 20 Mar 2019BIOS zip—344 KB - Dell Inc A11 DELL OPTIFLEX GX520
Firmware for the Dell OptiPlex GX520 desktop, version A11 according to the name, packed into a 371 KB RAR archive.
BIOS · 371 KB · 28 Mar 2022BIOS rar—371 KB - DellInc A11 DELL OPTIFLEX GX520
BIOS firmware for the Dell OptiPlex GX520 desktop, version A11, supplied as a RAR of roughly 325 KB.
BIOS · 325 KB · 5 Feb 2018BIOS rar—325 KB