Dell latitude 7410 8fc8 bios password

[braillard nicolas]

how to do it? I have a new and empty hard drive in it? no windows, I just want to install a new one
but impossible to boot on a usb key without administrator password

[shiyab]

hello it is impossible for me to recover the bios backup because the pc asks me for the administrator password

post backup bios

[braillard nicolas]

hello it is impossible for me to recover the bios backup because the pc asks me for the administrator password

[shiyab]

processor intel i5-10310U 1.70GHz

post backup bios

[braillard nicolas]

the service tag : 7YGJ273
bios version 1.33
dell latitude 7410

where i find the motherbord name?

[peste]

Hello Friends Can you helo me to find my password admin? 7YGJ273-8FC8 thanks

post the Service Tag..post the original content of the bios chip, the motherboard model, the full name and model of the laptop,etc.

[braillard nicolas]

Hello Friends Can you helo me to find my password admin? 7YGJ273-8FC8 thanks

[Calgacus]

Thanks again guys, followed the advice changing the two pairs of bits at the beginning of the file. It booted into factory mode as expected and all setup again

Very much appreciate all your time as always.

Paul

[volinakis]

Hi Guys,

So Looking at my Bin file, can anyone advise if its only two blocks i need to edit or four..... thanks again......Paul

as I wrote, they are in pairs, just group bytes by 4 and search for blocks ending in hex 00FCAA and 00FDAA and modify them onto 00FC00 and 00FD00.

[Calgacus]

Hi Guys,

So Looking at my Bin file, can anyone advise if its only two blocks i need to edit or four..... thanks again......Paul

[volinakis]

Thanks SMDFlea
im glad i checked, appreciate your help as always. Hopefully someone can help with the bios, unless you are able to advise which offsets need changed in my bios bin file, I am able to edit the file in HXD just not sure as to which 4 bits to change back to 00 as when comparing the untouched file from the first one from a few days ago the offsets dont match up with the untouched file from the second laptop identical model. the only difference i am aware of is i saw windows update perform a bios update when seting it up.

any advice appreciated, always looking to learn more

Thanks

Paul

unlocking dell 8fc8 suffix is very simple, no need to invent "scripts" and discover the wheel. Open file with HxD, group bytes by 4, press ctrl+F (Find function) and search for hex 00FCAA and 00FDAA and modify only strings end in 00FCAA and 00FDAA with 00FC00 and 00FD00 - in your case 2400FCAA andB400FDAA. Most often they are in pairs, but there are cases when you'll find only one string ends in 00FCAA and 2 end in 00FDAA. Those strings to be modified are in 1st part of the bios (EC Region)maximum 1,2Mb, there are cases when you'll find strings in middle or last part of bios, don't modify them!

[Calgacus]

Its a different bios,the service tag is BDKH793 ,find it with HxD, search for NVAR then scroll down until you see it in the right hand column, in ASCII B.D.K.H.7.9.3 . It has initialised firmware as well,meaning if you were to use that bios you would have to clean the ME firmware first.You would run into an issue with the service tag as well and would have to edit in another clean bios region.Best wait for someone to unlock your bios

Thanks SMDFlea
im glad i checked, appreciate your help as always. Hopefully someone can help with the bios, unless you are able to advise which offsets need changed in my bios bin file, I am able to edit the file in HXD just not sure as to which 4 bits to change back to 00 as when comparing the untouched file from the first one from a few days ago the offsets dont match up with the untouched file from the second laptop identical model. the only difference i am aware of is i saw windows update perform a bios update when seting it up.

any advice appreciated, always looking to learn more

Thanks

Paul

[Markus1741]

Hello here is the unlock file.
The offset lines that were edited are:
000f30c0
000f3e90
000f40c0
000f4e90
For GNU Linux I have a script for download on GitHub for people who are interested in this sort of thing.
I also uploaded a video to YouTube.
Maybe the link is allowed.
https://www.youtube.com/watch?v=_RIK7jIUEmU
Have fun

[SMDFlea]

Hi fauzanmint, i am comparing your supplied bin file with the original ir read from the chip for future reference im looking at them in HXD to pinpoint the 4 bits that needed changed as per a previous post, however the supplied file has many differences. forgive my lack of knowledge i just dont want to write this back and solder to the motherboard only to have to remove it again, can i ask .....is it a different bios file thats be uploaded ?....thanks....Paul

Its a different bios,the service tag is BDKH793 ,find it with HxD, search for NVAR then scroll down until you see it in the right hand column, in ASCII B.D.K.H.7.9.3 . It has initialised firmware as well,meaning if you were to use that bios you would have to clean the ME firmware first.You would run into an issue with the service tag as well and would have to edit in another clean bios region.Best wait for someone to unlock your bios

[Calgacus]

Try

Hi fauzanmint, i am comparing your supplied bin file with the original ir read from the chip for future reference im looking at them in HXD to pinpoint the 4 bits that needed changed as per a previous post, however the supplied file has many differences. forgive my lack of knowledge i just dont want to write this back and solder to the motherboard only to have to remove it again, can i ask .....is it a different bios file thats be uploaded ?....thanks....Paul

[Calgacus]

Try

Thanks m8, i will try this today, appreciate the fast reply

Paul

[fauzanmint]

Got another one from same customer
Dell Lattitude 7410
SN:2020AP2584
SERVICE TAG:2X5H2J3
BOARD:BOARD~FDX40 LA-J261P REV A00

Just wanted to ask,,,, i compared the unedited bios from the fisrt 7410 from couple days ago to the one im working on today and at the first hex offset the data is different so i am unsure if this would affect the outcome to corrupt the bios if i changed the four bits of data to put it into factory mode

I think windows may have updated the bios on this one and thats why its different ?

anyway i have uploaded the untouched bios read from the sencond laptop

Thanks again

Try

[Calgacus]

that`s what its supposed to do

Thanks SMDflea..... just passing on my experience of the process for others. I read up on the method on this thread and learned about the 4 bits that need set to put the laptop back into factory mode. I've tried to use this method for the 2nd same model laptop form same customer, but ive noticed the bin file is not the same, possibly due to windows updating the bios before i removed the chip. I'm not sure, but ive made a new post today.

[Calgacus]

Got another one from same customer
Dell Lattitude 7410
SN:2020AP2584
SERVICE TAG:2X5H2J3
BOARD:BOARD~FDX40 LA-J261P REV A00

Just wanted to ask,,,, i compared the unedited bios from the fisrt 7410 from couple days ago to the one im working on today and at the first hex offset the data is different so i am unsure if this would affect the outcome to corrupt the bios if i changed the four bits of data to put it into factory mode

I think windows may have updated the bios on this one and thats why its different ?

anyway i have uploaded the untouched bios read from the sencond laptop

Thanks again

[SMDFlea]

that`s what its supposed to do