Bios unlock for DELL LATITUDE 7420

[LBTT1121]

Original and patched both file attached
model dell 7420
board number LA-k371P

load bios on original IC

[srsyed1]

I did load on original ic its still same . Is it ic problem?

[Markus1741]

I did load on original ic its still same . Is it ic problem?

Hello try this new build file from your orig bios file ....

[srsyed1]

Hello try this new build file from your orig bios file ....

Now just fan spin keyboard light and after 30-40 sec reboot .

[Markus1741]

Now just fan spin keyboard light and after 30-40 sec reboot .

Yes, then everything is fine. That's the unlocking process. You'll have to be more patient. The Dell laptop can restart up to four times, and you'll then have to re-enter your service tag.

[srsyed1]

Yes, then everything is fine. That's the unlocking process. You'll have to be more patient. The Dell laptop can restart up to four times, and you'll then have to re-enter your service tag.

Hi thanks but its keep doing rebooting almost 30 times now. Still same no display and after keyboard light 30-40 sec just rebooting.

[LBTT1121]

Hi thanks but its keep doing rebooting almost 30 times now. Still same no display and after keyboard light 30-40 sec just rebooting.

bios ok , replate IC bios

[srsyed1]

bios ok , replate IC bios

Changed bios chip and flash provide file still same.and with provided file i can see backlight on display but no logo nothing . With 3 red 5 white flashing light .And after flash with original again same . 😔

[srsyed1]

I replaced the BIOS chip and flashed it with the file you provided. The laptop powers on and I can see the display backlight, but there’s no logo or image. The indicator lights flash 3 red and 5 white repeatedly.




When I reflash the original BIOS file, the screen only shows a white–blue–red–green color pattern.
i think my original file got corrupted .can you please help me on this. As i changed 4 new chip all same

[bretta]

help needed to unlock bios pwd

dell latitude 7440
bios 1.21.2
memory 32 gb
service tag 1z1zdy3
express service code 4296429147


thankyou.

[LBTT1121]

help needed to unlock bios pwd

dell latitude 7440
bios 1.21.2
memory 32 gb
service tag 1z1zdy3
express service code 4296429147


thankyou.

attach bios

[bretta]

i cannot retrieve bios. it is locked,
it is available as current or latest exe file on dell webite.

[bretta]

attach bios

i cannot retrieve bios. it is locked,
it is available as current or latest exe file on dell webite.

[bretta]

attach bios

https://www.dell.com/support/home/en...driverid=2v9mf
search tag, 1z1zdy3-8fc8

latest ver is available here,

[LBTT1121]

https://www.dell.com/support/home/en...driverid=2v9mf
search tag, 1z1zdy3-8fc8

latest ver is available here,

post the original contents of the bios chip..not the update on the website..
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..

you need an SPI programmer

[Murtaza527]

Hi everyone please remove the lock from this bios its Dell 7420 model service tag # F88Y7D3 express : 33150497223

[SMDFlea]

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

[LBTT1121]

Hi everyone please remove the lock from this bios its Dell 7420 model service tag # F88Y7D3 express : 33150497223

try and feedback

[Murtaza527]

thank you very much and that link is very useful for next i will try it myself