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Dell XPS 15 9550 bios password help!!!
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.
(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?
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)
You can use Universal BIOS Backup ToolKit 2.0 with custom size (8M or 16M) for first analyze.
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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