Microsoft Surface laptop 4 UEFI password

[volinakis]

Hi!
I succesfuly removed UEFI pass, now i need to remove SEMM certificate but i don't know how to start
Please help me
Thanks!

invalidate IPCVN

[tataie]

Please help to remove bios pass

Model Surface Laptop 4 1951

S/N: 042177713557

Thank you!

Hi!
I succesfuly removed UEFI pass, now i need to remove SEMM certificate but i don't know how to start
Please help me
Thanks!

[peste]

I have a surface 4 laptop (model 1951) which I cannot get past the UEFI/ BIOS system password as I do not have a record. Cannot change the boot sequence in the UEFI given no password, and cannot access windows as do not have the bitlocker key.


Would anyone be able to help guide me through what to do - have read various posts about scripts, certificates, BIOS dumps, but really don't have a clue how to do this. Have tried opening and taking out the SSD, but this did not reset the UEFI password. I cannot locate a CMOS style battery, so assume it doesn't have one.

Have all my data stored on network drive and onedrive, so quite happy to erase the whole thing - if only I could...

post S/N, full name and model, motherboard model,post the original contents of the bios chip..etc.

you need an SPI programmer...here is a video for example..https://www.youtube.com/watch?v=DWWi...nnel=ThisIsHow

[Bodge_it_and_run]

I have a surface 4 laptop (model 1951) which I cannot get past the UEFI/ BIOS system password as I do not have a record. Cannot change the boot sequence in the UEFI given no password, and cannot access windows as do not have the bitlocker key.


Would anyone be able to help guide me through what to do - have read various posts about scripts, certificates, BIOS dumps, but really don't have a clue how to do this. Have tried opening and taking out the SSD, but this did not reset the UEFI password. I cannot locate a CMOS style battery, so assume it doesn't have one.

Have all my data stored on network drive and onedrive, so quite happy to erase the whole thing - if only I could...

[tataie]

Please help to remove bios pass

Model Surface Laptop 4 1951

S/N: 042177713557

Thank you!

[giliy52480@degcos.com]

Try

I tried this but still no disp.

This surface laptop had a backlight flickering. I put some heat on the edp socket and some capacitors around (I think cold solder occurred) the socket, but after some days the problem came back. Then, immediately after turning it on, the system firmware update appeared, and during the test for the edp connector, whether it was broken or not, the system turned off and finally, when it turned on, the backlight was on, but no disp. When I pressed the F4 key to go to the bios, the display had some horizontal line on the screen with a backlight but no disp (the picture enclosed) and the CPU got warm. This line's place changed after the restart.

[minhdigital]

HI dear,

Surface laptop 4 1951

Sn: 036094623057

First the black screen system update bar showed and wouldn't complete(due to power off the system) , then the system turned off. After that, the blank screen and "backlight on", then the display wouldn't show surface logo, but the CPU got warm. The original bios have been enclosed. Please check the file and give me the proper bios.

Try

[giliy52480@degcos.com]

HI dear,

Surface laptop 4 1951

Sn: 036094623057

First the black screen system update bar showed and wouldn't complete(due to power off the system) , then the system turned off. After that, the blank screen and "backlight on", then the display wouldn't show surface logo, but the CPU got warm. The original bios have been enclosed. Please check the file and give me the proper bios.

[peste]

merged post..

[nobbie]

Hi,
I have a corrupted bios chip after an update.
If anyone has a dump I would be very grateful.
Model:
Microsoft Surface 4 (2021) Model 1950
Intel Core i5 11th Generation
512GB SSD
16GB Ram

Bios-Chip: W25R256JWPQ

S/N: 024302314457

Thank you

[silvertree]

I'm about to have a go at downloading the bios file from a Surface laptop 4 (1951), which is password locked at the bios level.
I'm interested in how you go about changing the bios file.
I've compared a few of the pairs of files above in HxD, and see that in every one a 3F has been changed to a 3C.

My question is, how do you know which 3F to change?

I suspect it is something to do with the serial number of the computer, but I am unable to find the serial number within the Hex file, and wonder what I'm doing wrong.
(Serial number of computer I'm about to work with is 025136421857)

I'd appreciate some insight please! Short of that, I might be back in a week or so with a file, for some direct help. 😊

Keen to understand - Thank you!

[Marcos Yanez]

I don't know, 2nd has volumes in Bios Region but if you don't have 2 identical readings it means you don't have a good bios backup.

oki, I just bought a microscope to ensure the pins are exactly well connected to have a good reading. Thanks for the help

[volinakis]

Oh , I understand now, thanks. There are differences...is the second bin also bad?

I don't know, 2nd has volumes in Bios Region but if you don't have 2 identical readings it means you don't have a good bios backup.

[Marcos Yanez]

compare readings, when you have 2 identical it means you have a good backup. The size is due to chipset, if programmer detected as being 256Mb will always generate a 33.554.432 bytes file. If you use HxD see tab "Analyse" and you have there "Compare"

Oh , I understand now, thanks. There are differences...is the second bin also bad?

[volinakis]

I tried again

compare readings, when you have 2 identical it means you have a good backup. The size is due to chipset, if programmer detected as being 256Mb will always generate a 33.554.432 bytes file. If you use HxD see tab "Analyse" and you have there "Compare"

[Marcos Yanez]

Thank you! I'm using a WSON8 chip probe pin adaptor. I did 3 readings and the file come always with the same size.

Can be the issue with the adaptor?

I tried again

[Marcos Yanez]

read again bios chipset, Bios Region has no volumes...

Thank you! I'm using a WSON8 chip probe pin adaptor. I did 3 readings and the file come always with the same size.

Can be the issue with the adaptor?

[volinakis]

First of all, I'm new to this, so please forgive any mistakes I may make.

I have a Surface Laptop 4 that's blocked with DFCI.


model Surface Laptop 4 / 1950 /
motherboard / M1098028-008 /
spi chip / WINBOND W25R256JWP


SN/050321323057

Any help will be really appreciated

read again bios chipset, Bios Region has no volumes...

[peste]

post merged..

[Marcos Yanez]

First of all, I'm new to this, so please forgive any mistakes I may make.

I have a Surface Laptop 4 that's blocked with DFCI.


model Surface Laptop 4 / 1950 /
motherboard / M1098028-008 /
spi chip / WINBOND W25R256JWP


SN/050321323057

Any help will be really appreciated