Bios unlock for DELL LATITUDE 7420

[korchi071]

Latitude 7420

Service Tag: G5S5LN3

Thank you so much! Everything works

[Viktor-x]

Hello, my BIOS chip is damaged, I bought a new one but it needs a firmware update.
Which one can I use?
Dell latitude 7420
ST: DQPK6G3
LA-K371P REV: 3.0 (a02)

[peste]

Hello, my BIOS chip is damaged, I bought a new one but it needs a firmware update.
Which one can I use?
Dell latitude 7420
ST: DQPK6G3
LA-K371P REV: 3.0 (a02)

post the contents of the bios chip even if it is corrupted..

[Viktor-x]

post the contents of the bios chip even if it is corrupted..

yes

[hoaca388]

yes

Latitude 7420

Service Tag: DQPK6G3

[trepachka]

Hello, I have this Latitude 7420 laptop with bios lock. Please, help me unlock it.

Latitude 7420
ST: 1DQ46M3

Thank you.

[lapfix]

Hello, I have this Latitude 7420 laptop with bios lock. Please, help me unlock it.

Latitude 7420
ST: 1DQ46M3

Thank you.

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

[trepachka]

I am not sure what happened. I reflashed the bios chip and computer is not switching to 20V. I checked the issue and PL201 coil (part of PU200) is measuring only 20 ohms which indicates a short to me. I will address this first, then report whether the password is gone.

[trepachka]

Ok, I reflashed the bios. On 1st boot computer fan runs at full spead. On 2nd boot the keyboard backlight comes on along with the charging light. Then, the whole thing turns off and repeats the cycle.

I soldered the original bin and the computer boots with the password. Can you rework your bin file for me to try again?

Thanks.

[lapfix]

Try again the same unlocked file , don't forget to disconnect cmos and Hdd/SSD

[trepachka]

I tried many bin files. The one that actually worked is located in post # 169:

https://www.badcaps.net/forum/troubl...ude-7420/page9

[lapfix]

I tried many bin files. The one that actually worked is located in post # 169:

https://www.badcaps.net/forum/troubl...ude-7420/page9

Weired !! i just unlock your file .. is it the original one !

[trepachka]

Yes. I reflashed the bios chip with the original content and the computer booted with the admin password again. I then located this particular bios file, had the bios chip reflashed and the computer booted without the password. I just had to update the service tag as it was empty per instructions.

No worries. Thanks for your assistance.

[jackx]

THANK YOU FOR all help

[mthxld]

Hi, can you remove the BIOS password?

Board model: LA-K371P rev : 3.0 (A02)
Service Tag: 76TF4M3

Thanks in advance!

[lapfix]

Hi, can you remove the BIOS password?

Board model: LA-K371P rev : 3.0 (A02)
Service Tag: 76TF4M3

Thanks in advance!

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