Dell Latitude 5420 Bios Password 8FC8

[SMDFlea]

Flash the bios again and verify what you have written to the chip. Check your soldering, put batteries back in afterwards.

[alontest]

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

[Smersh1008]

Thank you both
Now there are constant restarts, the fan is running at maximum speed, and colors appear on the screen from time to time (red, blue, green)... Does someone have an idea ?

[lapfix]

Hi,
Can anyone help me with my laptop ?
JTOCCK3
Thank you

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

Good luck.

[Smersh1008]

try and feedback

I tried,
First attempt: the screen was red, blue, green, then white, and then it restarted 3 times for 3/4 seconds.
I tried to implement the original BIOS again, and it no longer starts (it restarts 3/4 times for a few seconds, the screen remains black).
I tried without the battery and the CMOS battery.

[LBTT1121]

Hi,
Can anyone help me with my laptop ?
JTOCCK3
Thank you

try and feedback

[Smersh1008]

Hi,
Can anyone help me with my laptop ?
JTOCCK3
Thank you

[LBTT1121]

Hello everyone, I have the same Issue with my latitude5420, how do I unlock it?

post the original contents of the bios chip and service tag..

[whatup123]

Hello everyone, I have the same Issue with my latitude5420, how do I unlock it?

[desteny]

try and feeedback

Thank a lot,

Unfornately i've destroyed the motehrboard... the laptop refuse to turn on...

[peste]

Would be so kind to unlock Dell 5330...with bios password

ST: J623QL3
Model number: 0x0B03

post the original contents of the bios chip..

[T. Ferreira]

Would be so kind to unlock Dell 5330...with bios password

ST: J623QL3
Model number: 0x0B03

[iori1881]

try..

THANK YOU ...IT WORKS BUT THE FAN STILL SPINING AND MAKE NOISE

[LBTT1121]

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

Pierre

try and feeedback

[SMDFlea]

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

[desteny]

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

Pierre

[peste]

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

THANK YOU

try..

[iori1881]

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

THANK YOU

[Screemer]

Try # 928

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

[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