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Julian Bailey replied to Latitude 7420 password ,corrupt ME firmware

in BIOS Requests ONLY!

06-04-2025, 02:48 PM
You, are a lifesaver of laptops! It has worked!

MASSIVE thank you. It has been saved from being a parts laptop!

[ATTACH=JSON]{"data-align":"none","data-size":"small","title":"20250604_194603.jpg","data-attachmentid":3652312}[/ATTACH]
The SSD is also now showing in the BIOS and Boot menu!

So happy, thanks again for your help.You, are a lifesaver of laptops! It has worked!

MASSIVE thank you. It has been saved from being a parts laptop!

[ATTACH=JSON]{"data-align":"none","data-size":"small","title":"20250604_194603.jpg","data-attachmentid":3652312}[/ATTACH]...

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Julian Bailey replied to Latitude 7420 password ,corrupt ME firmware

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06-03-2025, 11:37 PM
Hmm interesting... The mobo isn't working as it should so think I am going to flash the bios chip and the TB chip with the related files and see what it does.

Laptop can't be used as it is so may as well!

Cheers...

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Julian Bailey replied to Latitude 7420 password ,corrupt ME firmware

in BIOS Requests ONLY!

06-03-2025, 03:06 PM
I have found this BIOS file on BIOS Archive, which has 2x .bin files. One of them is listed for the W25Q80DVSIG chip (which is on my motherboard near the BIOS chip.

Do you think I need to flash that chip as well with that BIOS file?

When I open the file up there is some retimer code in there...

[ATTACH=JSON]{"alt":"Click image for larger version Name:\tScreenshot 2025-06-03 220128.jpg Views:\t0 Size:\t24.5 KB ID:\t3651559","data-align":"none","data-attachmentid":"3651559","data-size":"full","title":"Screenshot...

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Julian Bailey started a topic Latitude 7420 password ,corrupt ME firmware

in BIOS Requests ONLY!

06-03-2025, 09:50 AM
Latitude 7420 password ,corrupt ME firmware

This is the backup of the original BIOS that is admin locked and possibly corrupt ME firmware

ST: C91L2F3

Cheers...

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Julian Bailey replied to BIOS update wont complete - Dell Latitude 7420

in Troubleshooting Laptops, Tablets, and Mobile Devices

06-03-2025, 06:26 AM
I did take a backup of the old BIOS but wasn't aware of the Thunderbolt FW? Is there a separate BIOS chip for that?

Cheers...

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Julian Bailey replied to BIOS update wont complete - Dell Latitude 7420

in Troubleshooting Laptops, Tablets, and Mobile Devices

06-03-2025, 02:33 AM
This is for a different laptop with ST: C91L2F3

Cheera...

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Julian Bailey replied to BIOS update wont complete - Dell Latitude 7420

in Troubleshooting Laptops, Tablets, and Mobile Devices

06-03-2025, 02:07 AM
The laptop came in with an Admin password, so we updated the bios with a programmer to a bios with manufacturing mode activated.

This is when issues started and it took a few different BIOS files to get the laptop to boot again, so I do think it's a corrupt firmware some where. But how to force it to do the firmware update that it's failing on I don't know.

Maybe trying a newly programmed BIOS chip?

The only 2x BIIS files I can find for this model of motherboard is on Telegram BIOS Archive, so I have a feeling those files may be corrupt in some way?...

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Julian Bailey replied to BIOS update wont complete - Dell Latitude 7420

in Troubleshooting Laptops, Tablets, and Mobile Devices

06-03-2025, 01:33 AM
The BIOS file is the latest rcv file from Dell website, so not sure how else the BIOS can be fixed.

Cheers...

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Julian Bailey replied to BIOS update wont complete - Dell Latitude 7420

in Troubleshooting Laptops, Tablets, and Mobile Devices

06-02-2025, 11:17 PM
So motherboard isnt repairable I take it? Shame as the laptop is in as new condition.

Cheers...

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Julian Bailey started a topic BIOS update wont complete - Dell Latitude 7420

in Troubleshooting Laptops, Tablets, and Mobile Devices

06-02-2025, 01:39 PM
BIOS update wont complete - Dell Latitude 7420

Hi all

Anyone come across this issue where a BIOS flash will only part complete?

It will update the system BIOS and Primary EC BIOS fine but fails to update the Intel TBT Retimer, Intel TBT Retimer 2 and ME Firmware.

NVMe m.2 drive isnt detected in the BIOS, but you can get into the BIOS fine and it all works in there as intended.

The drive works fine in another laptop.

Link to a video I made of what its doing here:

Any ideas on how to overcome this?

CheersHi all

Anyone come across this issue...

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Julian Bailey replied to Bios unlock for DELL LATITUDE 7420

in BIOS Requests ONLY!

10-24-2024, 01:12 AM
Thank you I will give them a go, but I think the chip is corrupt or died. It reads but takes a long time and when I write a bios to it (even the original) it comes with a verify error 😔...

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Julian Bailey replied to Bios unlock for DELL LATITUDE 7420

in BIOS Requests ONLY!

10-23-2024, 02:37 PM
hmmm, the BIOS chip is a 25R256JVEN but my CH341A programmer only has 25Q256BV and 25Q256FV as an option when it detects the chip. Could this be the issue?

[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"Screenshot 2024-10-23 213746.jpg","data-attachmentid":3490973}[/ATTACH]

Thankshmmm, the BIOS chip is a 25R256JVEN but my CH341A programmer only has 25Q256BV and 25Q256FV as an option when it detects the chip. Could this be the issue?

[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"Screenshot...

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Julian Bailey replied to Bios unlock for DELL LATITUDE 7420

in BIOS Requests ONLY!

10-23-2024, 12:41 PM
Ok so Ive pulled the BIOS off the BIOS chip by UC2, see attached.

If someone can take a look and unlock it that would be great.

Service tag: 28SH0F3
Make / Model: Dell Latitude 7420
Motherboard is an i5 11th Gen, 8GB RAM
Motherboard model: GDC31 LA-K371P Rev:3.0 (A02)

Thanks...

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Julian Bailey replied to Bios unlock for DELL LATITUDE 7420

in BIOS Requests ONLY!

10-23-2024, 02:36 AM
Ahhh, sorry, searched online and it said the bios chip was to the left of the WWAN slot!

Will take a look later!

Cheers...

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Julian Bailey replied to Bios unlock for DELL LATITUDE 7420

in BIOS Requests ONLY!

10-23-2024, 01:22 AM
What do you mean sorry?
Thanks...

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Julian Bailey replied to Bios unlock for DELL LATITUDE 7420

in BIOS Requests ONLY!

10-22-2024, 03:37 PM
Hi, info below.

Service tag: 28SH0F3
Make / Model: Dell Latitude 7420
Motherboard is an i5 11th Gen, 8GB RAM

Many thanks...

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Julian Bailey replied to Bios unlock for DELL LATITUDE 7420

in BIOS Requests ONLY!

10-22-2024, 01:51 PM
Hi all

Is anyone able to remove the admin / BIOS password for the attached please?

Many thanks...

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Julian Bailey replied to HP ProBook 445 G8 Battery not charging

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-12-2024, 12:05 AM
I wouldn't feel comfortable, if it was to work again, to go back in to the laptop.

I will however give it a go to see if it can be repaired purely for learning purposes only.

Thank you for your help mon2, it's appreciated....

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Julian Bailey replied to HP ProBook 445 G8 Battery not charging

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-11-2024, 02:40 PM
2 Photos

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Julian Bailey replied to HP ProBook 445 G8 Battery not charging

in Troubleshooting Laptops, Tablets, and Mobile Devices

10-11-2024, 02:11 PM
Sadly the BQ blew a hole which also took out another chip on the other side causing it to blow a whole in the board

RIP!Sadly the BQ blew a hole which also took out another chip on the other side causing it to blow a whole in the board

RIP!...

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