Unlock Bios Password Lenovo Thinkpad P50 - BP500 NM-A451 REV 1.0, pw bios

[mariusdumi]

Hi, I have a ThinkPad P50 I bought used on eBay, with an invoice from the seller. The seller doesn't know the password, and I need to remove the BIOS password. I have the CH341 flasher purchased from Amazon along with the 8-pin clamp. Can you tell me how to extract the BIOS and then decrypt it?
I also need to identify the correct chip to read.
MB model: bp500 nm-a451 rev 1

 

[Salimeh Bolboli]

Please send the Bios file.

 

[mariusdumi]

I also need to identify the correct chip to read.

 

[Vahab Hemmati]

Schematic - lenovo thinkpad p50 lcfc bp500 nm-a451 schematic

lenovo thinkpad p50 lcfc bp500 nm-a451

dr-bios.com

 

[mariusdumi]

this is my dump

 

[Salimeh Bolboli]

this is my dump

 

[mariusdumi]

After erase the old bios and writing the new one with the patch I find this screen, how do I proceed?

 

[Salimeh Bolboli]

Key: 8000184

 

[mariusdumi]

Sorry, Yesterday I hadn't connected all the PC components. Today the hardware ID changed.
The new hardware ID is 2096686

 

[Vahab Hemmati]

Sorry, Yesterday I hadn't connected all the PC components. Today the hardware ID changed.
The new hardware ID is 2096686

8886540

 

[mariusdumi]

The key is incorrect.

I also notice that when I restart my PC, the key sometimes changes.
I don't understand this procedure.
Can you provide me with a detailed guide? I'm missing something.

 

[Vahab Hemmati]

"Instructions for use"

Remove all battery and CMOS battery

press F1 to enter setup: password 1234
wait 20sec or more.
Enter any ID to hardware Id.
Press 2x space bar when asked.
Turn off the computer.
and restore your original bios .

Enjoy.

If 2x 5beep, it's normal.
I didn't do checksum but it must light up anyway.
Wait minimum 30sec before screen logo light on. Must turn on/off several times by itself.