Dell Latitude 5420 Bios Password 8FC8

[crownmobile3]

try...

No display after flash Pached File sir.
I think it was my mistake while backing up BIOS.bin, so I backed up again and posted again for Password removal, sir.
Thanks sooo much sir for ur Efforts.

[SMDFlea]

Good afternoon.

I can't join on my computer... I mean, not even in the windows, so I only can go to BIOS booting mode.
So I need to format my laptop, but has an admin password to boot from my Pen.
I searched a lot to solve my problem but I can't go any further.
Can you help me ?
Laptop: Dell Latitude 5420 model P137G i5.
Service Tag: H6YNNQ3
Thanks in advance.

Post moved to 5420 thread topic. If the password suffix is 8FC8 we can only help you if you post your bios backups, you will need an SPI programmer to do that, read the bios guides, https://www.badcaps.net/forum/troubl...rces-and-tools

[Pedro Caiado]

Good afternoon.

I can't join on my computer... I mean, not even in the windows, so I only can go to BIOS booting mode.
So I need to format my laptop, but has an admin password to boot from my Pen.
I searched a lot to solve my problem but I can't go any further.
Can you help me ?
Laptop: Dell Latitude 5420 model P137G i5.
Service Tag: H6YNNQ3
Thanks in advance.

[peste]

Kindly Clear Admin Password Plz

GDF40 LA-K491P Rev: 2.0 (A01)
ServiceTag: CYVC4M3
Express : 28229871963

try...

[crownmobile3]

Kindly Clear Admin Password Plz

GDF40 LA-K491P Rev: 2.0 (A01)
ServiceTag: CYVC4M3
Express : 28229871963

[hoaca388]

Hi.Please help to unlock my bios password Latitude 5420.
Thank you in advanced.

ST: 3Q7F8K3

Wrong chip.

[botsiah]

Hi.Please help to unlock my bios password Latitude 5420.
Thank you in advanced.

ST: 3Q7F8K3

[Smersh1008]

It's working, thank you so much ! The ST is different (is it a big deal ?) and worse, now the fan no longer starts. Could it be because of the bios?

Correction, i updated the bios and now it works perfectly. Thank you all !

[Smersh1008]

Try this
https://www.badcaps.net/forum/troubl...60#post1708760

Post n #5

It's working, thank you so much ! The ST is different (is it a big deal ?) and worse, now the fan no longer starts. Could it be because of the bios?

[lapfix]

Here's the 4 versions i made

Try this
https://www.badcaps.net/forum/troubl...60#post1708760

Post n #5

[peste]

It wasn't the clip I used, I used a WSON8 Pogo, is that still no good?

Do you know if when the chip is unsoldered, can it be read with something like this?

if you have a 25rh256cxiq bios chip this adapter is good..

[modd1uk]

The bios chip must be unsoldered from the board before writing or reading..
do not use the clip, you may have errors..if you do not have anything to unsolder it with,
solder wires between the programmer and the bios chip..

here is a video for example..https://www.youtube.com/watch?v=DWWi...l=ThisIsHow

It wasn't the clip I used, I used a WSON8 Pogo, is that still no good?

Do you know if when the chip is unsoldered, can it be read with something like this?

[peste]

Can somebody advise if these BIOS dumps are correct please?

I read 3 in Asprogrammer with the correct 25rh256cxiq selected, the other I read in neoprogrammer with W25Q256FV selected.

When I compare them in a hex viewer they are all different, even the three dumped with asprogrammer, used a CH341A and WSON8 pogo.

The goal is to remove the admin password, however I don't want to even attempt it until I know these backups are good as I've already bricked my other 5420 tonight!

Service tag is C4617M3

Thanks in advance.

The bios chip must be unsoldered from the board before writing or reading..
do not use the clip, you may have errors..if you do not have anything to unsolder it with,
solder wires between the programmer and the bios chip..

here is a video for example..https://www.youtube.com/watch?v=DWWi...l=ThisIsHow

[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..

[modd1uk]

Can somebody advise if these BIOS dumps are correct please?

I read 3 in Asprogrammer with the correct 25rh256cxiq selected, the other I read in neoprogrammer with W25Q256FV selected.

When I compare them in a hex viewer they are all different, even the three dumped with asprogrammer, used a CH341A and WSON8 pogo.

The goal is to remove the admin password, however I don't want to even attempt it until I know these backups are good as I've already bricked my other 5420 tonight!

Service tag is C4617M3

Thanks in advance.

[Smersh1008]

Upload your corrupted bios

Here's the 4 versions i made

[lapfix]

Hi,
I've repeated the exercise three times, and it doesn't work. Looking at my backups with hex, I realized they weren't exactly identical (...). I think they are corrupted.
How can I recover a file? Can I try a BIOS from another PC? (Sorry for my question, I'm new here)
ST: JTOCCK3
GDF40 LA-K491P Rev: 2.0(A01) 2021-04-28
Thank you again for your help

Upload your corrupted bios

[Smersh1008]

Hi,
I've repeated the exercise three times, and it doesn't work. Looking at my backups with hex, I realized they weren't exactly identical (...). I think they are corrupted.
How can I recover a file? Can I try a BIOS from another PC? (Sorry for my question, I'm new here)
ST: JTOCCK3
GDF40 LA-K491P Rev: 2.0(A01) 2021-04-28
Thank you again for your help

[alontest]

1st boot, press F2, write service tag, disable Absolute, save, restart. 2nd boot press Alt+F to exit manufacturing mode.
Good luck.

You are star! Thank you!

[lapfix]

Hi, can you help me please remove BIOS password.
Dell Latitude 5420
ST: H64Z2D3
MB: LA-K491P REV: 2.0(A01)

1st boot, press F2, write service tag, disable Absolute, save, restart. 2nd boot press Alt+F to exit manufacturing mode.
Good luck.