latitude 5420 board LA-k491P bios problem.

[peste]

Hello everyone,

I have a Dell Latitude 5420 (tested without HDD) and I’m running a diagnostic tool such as Aiken Workbench. The problem is that the tool detects the onboard LAN card, but it shows the message:

"no working driver for it"
and the test result is NO Driver.

Interestingly, when I install Windows, the LAN card works perfectly fine, which confirms that the hardware itself is okay. I have tried multiple cables and diagnostic environments, but the result is the same.

For comparison, I have a BIOS dump from a working unit and another from the problematic unit. The file sizes are identical. I suspect the issue might be related to a missing or corrupted PXE/UEFI network driver module in the firmware.

My questions:

• Has anyone experienced this issue before?
• What are the recommended steps to add the proper LAN driver to a diagnostic/WinPE environment, or to safely repair the firmware?
• If no solution can be found, I would appreciate it if any expert who knows how to fix this fault could contact me privately to suggest the right approach.

Thank you in advance for your help.

post S/T, full name and model, motherboard model, ,etc.
post the contents of the bios chip even if it is corrupted..

[devp62]

Hi Hope someone can help me , I have a latitude 5420 that came in with a damaged chip as someone has has a go at repairing the laptop.
I have replaced the chip and reprogramed it but now the machine come to life but gets stuck at the dell logo and get the 3 amber x6 white led flash, the old chip had a hole init so cant read any thing off it.
Can some on help pls
St: 6RKDJQ3
Latitude 5420
Motherboard model :-GDF-40 LA-491P Rev 2.0 ( A01 )
Thanks

[Laboratorio JG]

HI, COULD YOU HELP ME WITH THIS BIOS? IT SHOWS A TPM ERROR AND HAS AN ADMINISTRATOR KEY? CAN YOU HELP ME PLEASE?
BOARD MODEL: GDF40 LA-K491P REV 2.0(A01)
2020-11-16
DELL MODEL: LATITUDE 5420
ST: 4X036D3

Could someone please help me, I've tried other bios and it doesn't work, could you help me with the one I sent please?

[Omar Villalba]

Re: latitude 5420 bord LA-k491P bios problem.



ok.see pm.

Hello,
I'm having the following issue: I tested this BIOS and the system boots up without any problem, but when the operating system starts, the BIOS gets updated and the computer stops turning on, only showing the message "BIOS CORRUPTED."
Has anyone else experienced this issue?

DELL LATITUDE 5420
GDF40 LA-K491P
Rev: 2.0 (A01)
PWB: 2FM7C
ST: F4243F3

I'm attaching the original BIOS.

[hoaca388]

Hello,
I'm having the following issue: I tested this BIOS and the system boots up without any problem, but when the operating system starts, the BIOS gets updated and the computer stops turning on, only showing the message "BIOS CORRUPTED."
Has anyone else experienced this issue?

DELL LATITUDE 5420
GDF40 LA-K491P
Rev: 2.0 (A01)
PWB: 2FM7C
ST: F4243F3

I'm attaching the original BIOS.

Latitude 5420
Service Tag: F4243F3