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Dell XPS 15 9550 bios password help!!!
#1
I just got duped into buying a used Dell laptop. This laptop have problem of overheating.

After doing some research, the only way to resolve this issue to to undervolt the CPU. However, to do that I need to downgrade the BIOS to lower version as the new version has locked the ability to undervolt.

Now the problem is I cannot downgrade the BIOS because it is system locked. A password is required to make changes to the BIOS including updating/downgrading BIOS. I have contacted dell and they gave me a password that doesn't work. So now I am in need of help on how to downgrade the BIOS or reset the BIOS password. Appreciate anyone who can point me to the right direction.

Thank you.
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#2
(09-20-2021, 09:30 AM)abubin Wrote: I have contacted dell and they gave me a password that doesn't work.
Press Ctrl+Enter after typing manufacturer's password.
Can you make current BIOS dump?
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#3
Tried CTRL+ENTER many times but it doesn't work.

Ok, let me try to do BIOS dump.

Edit: do I need to buy some devices to do the BIOS dump?

CH341A EEPROM USB Programmer
SOIC8 Clip


Attached Files Thumbnail(s)
   
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#4
You can use Universal BIOS Backup ToolKit 2.0 with custom size (8M or 16M) for first analyze.
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#5
I have used Universal BIOS Backup Toolkit 2.0 to extract the BIOS.

Attached are 2 files with custom size 8mb and 16mb. It did detected 16mb.

The toolkit also detect the BIOS as AMIBIOS (not sure how accurate it is).

I assume I have to start poking into the ROM files to remove the password?

Appreciate the help.


Attached Files
.rar   xps15-9550-1.14.0.rar (Size: 4.7 MB / Downloads: 3)
.rar   xps15-9550-1.14.0a.rar (Size: 4.67 MB / Downloads: 2)
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#6
I have good news - read PM.
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