Dell Latitude 5420 Bios Password 8FC8

[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.

[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.

[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..

[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.

[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

[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

[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.

[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

[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

[Lordemestre]

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

[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..

[Bios White]

Latitude 5420

Service Tag: JQ5SZH3

Working OK, thank hoaca388

[fealessjiant]

Hey all joined this forum for this very purpose, I've been searching for hours for a solution hoping someone here can help
Dell 5430 with bios password.
Service Tag: FYSXST3-8FC
Thanks in advance.

[LBTT1121]

Hey all joined this forum for this very purpose, I've been searching for hours for a solution hoping someone here can help
Dell 5430 with bios password.
Service Tag: FYSXST3-8FC
Thanks in advance.

attach bios dump

[Screemer]

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.

I am attaching my 2 bios files, the dump (that might be corrupt) and the fixed file that I have tried to restore back to the chip. However the computer doesn't give a beep or blink when reattching cmos battery and main battery, hooking up power supply through USB-C adapter. I have no clue if my bios dump is corrupt and that's the reason for the laptop not even showing Dell logo or what could be wrong.
8FC8_4_Cleared.bin cleared from BIOS passwords
8FC8_4_Cleared_FCFD.bin cleared from bios password and factory deafaulted
8FC8_original.bin original dump from bios chip, untouched
W25Q256FV.BIN unknown file, don't really know where it came from
W25Q256FV (1).BIN unknown file, don't really know where it came from

[hoaca388]

I am attaching my 2 bios files, the dump (that might be corrupt) and the fixed file that I have tried to restore back to the chip. However the computer doesn't give a beep or blink when reattching cmos battery and main battery, hooking up power supply through USB-C adapter. I have no clue if my bios dump is corrupt and that's the reason for the laptop not even showing Dell logo or what could be wrong.
8FC8_4_Cleared.bin cleared from BIOS passwords
8FC8_4_Cleared_FCFD.bin cleared from bios password and factory deafaulted
8FC8_original.bin original dump from bios chip, untouched
W25Q256FV.BIN unknown file, don't really know where it came from
W25Q256FV (1).BIN unknown file, don't really know where it came from

Try # 928

[Screemer]

Try # 928

Thanks a lot.. Worked like a charm.. Actually posting from the 5420 right now. So very appreciated.

[iori1881]

hello everyone ... i need bios unlock for my dell 5420 ,s/n : 2VYR2D3

THANK YOU

[peste]

hello everyone ... i need bios unlock for my dell 5420 ,s/n : 2VYR2D3

THANK YOU

try.. patched_Dell 5420 backup.rar

[desteny]

Hello there !
Dell 5420 with bios password.
Service Tag: JD41BK3
Thanks in advance.

Pierre

[SMDFlea]

https://www.badcaps.net/forum/troubl...23#post1622423

[LBTT1121]

Hello there !
Dell 5420 with bios password.
Service Tag: JD41BK3
Thanks in advance.

Pierre

try and feeedback