Dell Latitude 5420 Bios Password 8FC8

[Bios White]

Latitude 5420

Service Tag: JQ5SZH3

Working OK, thank hoaca388

[peste]

Hello!
Can anyone help me !!
Dell 5420 with bios password.
Service Tag: 5QW67D3
Thanks in advance.

post the original contents of the bios chip..

[Lordemestre]

Hello!
Can anyone help me !!
Dell 5420 with bios password.
Service Tag: 5QW67D3
Thanks in advance.

[hoaca388]

I downloaded the BIOS from a forum, but it takes 30 seconds for the DELL logo to appear. Can someone help me fix clear ME this ? Thanks
Dell Latitude 5420
LA-K491P Rev: 3.0 A02
Service Tag : JQ5SZH3

Latitude 5420

Service Tag: JQ5SZH3

[Bios White]

I downloaded the BIOS from a forum, but it takes 30 seconds for the DELL logo to appear. Can someone help me fix clear ME this ? Thanks
Dell Latitude 5420
LA-K491P Rev: 3.0 A02
Service Tag : JQ5SZH3

[Screemer]

ST: JCNSXD3
I think I have v. 1.30.0 10 Aug 2023 version of the official Dell BIOS
at least I know it's a i7 processor and running OS from a SSD disk. I think it has 2 x 16Gb RAM

Is this enough information hoaca388? And do you know if anything can be done?
Is it possible to use another flash file with the same suffix or something? Could a update file from Dell be used? I am at the moment waiting for a hopefully better tool cable than the one I initially used that didn't quite fit the chip so I had to bend the pins fairly much to get it to connect to the pins on the chip and that wasn't so smart since the pins on the tool it self broke off I noticed after I had finished.
I have now ordered this one that seem to be a bit better built. https://www.aliexpress.com/item/1005...-specification

If anyone could help out I would really appreciate it.

[Screemer]

What is your serial number ? Please include as much machine information as possible.

ST: JCNSXD3
I think I have v. 1.30.0 10 Aug 2023 version of the official Dell BIOS
at least I know it's a i7 processor and running OS from a SSD disk. I think it has 2 x 16Gb RAM

[Cesar Aguiar]

Hello all,
I have no idea if anything can be done but thought I would through out the question at least.

I inherited a Dell that had Admin locked in BIOS.

So managed to find my way to this forum and found excellent guides on how to read the bios using a reader, edit the file to remove the password and then save the file back to the chip.
COOL, so got my self a CH341A, modded it to 3.3V and connected the tool, same as this but from other supplier
https://item.taobao.com/item.htm?spm...0602261764&mt=

So I read the BIOS, save it to HDD, modded the file, wrote it back to the chip. And the computer does nothing after pushing power button.
(Yes I had power out, battery out and BIOS battery out when working inside. )
My problem is I missed the part where you are supposed to dump more than once, verify the images before starting to work on the file.

It seem to me that the file I got from my BIOS was corrupt at least partly and the file I therefore wrote back to the chip is also corrupt. Stupid rookie mistake.

Now my question is, can the computer still be saved? Could another BIOS dump be written to my chip and get the laptop working? Could a BIOS update file be used from Dell?

Please, if any of you total gurus on this forum could try to help I would appreciate it.

WONDERFUL!

PERFECT file!

It worked Recording with the CH341A (sw v1.43) and the TL866-II (sw v12.78)

Note: in "MANUFACTURING MODE ACTIVE", the ALT+F command did not work for me... I repeatedly pressed the "+" key and it disabled "Manufacturing Mode"

Note 2: I want to donate BUT, MY Paypal is deactivated (I haven't used it for years) and I went through the Activation process and I'm Waiting.

Re: Dell Latitude 5420 Bios Password 8FC8



Latitude 5420

[hoaca388]

Hello all,
I have no idea if anything can be done but thought I would through out the question at least.

I inherited a Dell that had Admin locked in BIOS.

So managed to find my way to this forum and found excellent guides on how to read the bios using a reader, edit the file to remove the password and then save the file back to the chip.
COOL, so got my self a CH341A, modded it to 3.3V and connected the tool, same as this but from other supplier
https://item.taobao.com/item.htm?spm...0602261764&mt=

So I read the BIOS, save it to HDD, modded the file, wrote it back to the chip. And the computer does nothing after pushing power button.
(Yes I had power out, battery out and BIOS battery out when working inside. )
My problem is I missed the part where you are supposed to dump more than once, verify the images before starting to work on the file.

It seem to me that the file I got from my BIOS was corrupt at least partly and the file I therefore wrote back to the chip is also corrupt. Stupid rookie mistake.

Now my question is, can the computer still be saved? Could another BIOS dump be written to my chip and get the laptop working? Could a BIOS update file be used from Dell?

Please, if any of you total gurus on this forum could try to help I would appreciate it.

What is your serial number ? Please include as much machine information as possible.

[peste]

post merged..next time look for a thread with the name and model, motherboard model of the laptop, and post there, if you can't find it, then make a new thread..

[Screemer]

Hello all,
I have no idea if anything can be done but thought I would through out the question at least.

I inherited a Dell that had Admin locked in BIOS.

So managed to find my way to this forum and found excellent guides on how to read the bios using a reader, edit the file to remove the password and then save the file back to the chip.
COOL, so got my self a CH341A, modded it to 3.3V and connected the tool, same as this but from other supplier
https://item.taobao.com/item.htm?spm...0602261764&mt=

So I read the BIOS, save it to HDD, modded the file, wrote it back to the chip. And the computer does nothing after pushing power button.
(Yes I had power out, battery out and BIOS battery out when working inside. )
My problem is I missed the part where you are supposed to dump more than once, verify the images before starting to work on the file.

It seem to me that the file I got from my BIOS was corrupt at least partly and the file I therefore wrote back to the chip is also corrupt. Stupid rookie mistake.

Now my question is, can the computer still be saved? Could another BIOS dump be written to my chip and get the laptop working? Could a BIOS update file be used from Dell?

Please, if any of you total gurus on this forum could try to help I would appreciate it.

[Cesar Aguiar]

Re: Dell Latitude 5420 Bios Password 8FC8

Latitude 5420

WONDERFUL!

PERFECT file!

It worked Recording with the CH341A (sw v1.43) and the TL866-II (sw v12.78)

Note: in "MANUFACTURING MODE ACTIVE", the ALT+F command did not work for me... I repeatedly pressed the "+" key and it disabled "Manufacturing Mode"

Note 2: I want to donate BUT, MY Paypal is deactivated (I haven't used it for years) and I went through the Activation process and I'm Waiting.

[LBTT1121]

Please help me to unlock BIOS password
DELL Latitude 5420
Service Tag: GZP14J3-8FC8

Tks all...

attach bios dump

[AlJacks13]

Please help me to unlock BIOS password
DELL Latitude 5420
Service Tag: GZP14J3-8FC8

Tks all...

[peste]

Hello can you please unlock my BIOS too thanks
Service Tag: 4ZGB4M3

try..

[makisdal]

Hello can you please unlock my BIOS too thanks
Service Tag: 4ZGB4M3

[danito]

Thank you for your help I think my board has problem, although all voltages are available .

try

[mahlon simwnaja]

try

Thank you for your help I think my board has problem, although all voltages are available .

[LBTT1121]

Thank you for the quick response.
Tried your bios file but unit isn't turning on now

try

[mahlon simwnaja]

try

Thank you for the quick response.
Tried your bios file but unit isn't turning on now