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Flashing lenovo laptop Bios

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Kindev:
I am in the process of flashing the bios on my bricked lenovo thinkpad p53s. I am using a raspberry pi and a pomona test clip, all is going well and i can read the flash chip as well as remove the old bios but i am having trouble figuring out what file is the new bios. I extracted the .FL1 file from the most recent bios update (n2iuj38w.iso) from the lenovo website. Using UEFITool I can explore the contents of the .FL1 file but I don't seem to know what file to write onto the flash chip. The only file that has the same size required by the bios is the padding. I am pretty stumped so if anyone had any idea on how to proceed that would be greatly appreciated

coromonadalix:
don't double thread ....

Peabody:
I also have the P53s (20N6).  I see that you are using the CD .iso file, which I've ever used.  But the update utility (the .exe) opens for me in 7zip, although it's far from clear what all the files are.

I also found this forum thread:

https://forums.lenovo.com/t5/Gaming-Laptops/GUIDE-How-to-extract-BIOS-from-Lenovo-BIOS-Update-Package-such-as-ATCN37WW-exe/m-p/5008973

I don't know if it's relevant.  It appears to be based on this:

https://github.com/liho98/lenovo-bios-logo-extraction-guide

Would you mind explaining what bricked your laptop?

wraper:
I rather suggest finding full dump and replace ME region with clean one (mandatory, otherwise will have issues or not boot at all), replace SN, mac from original bios. What is exact model, motherboard? I'm not exactly a specialist in that and did not bother with laptop MB repair for a long time but AFAIK laptop bios updates usually don't even have a complete bios in them.
Here is full working dump (dirty ME) from
nm-d351 rev1.0 which may be used in this model
https://drive.google.com/file/d/1NHhjIi09BzTtOei9cf5pbWF6raP3BLol/view?usp=sharing

Kindev:
Thank you! I will try the suggestions. My laptop is type 20N6 with serial number PF292CDY. My laptop was bricked from the bios allowing me to enter special characters into the administration password. I did not know this was going to brick my laptop until i received the 0199 system security error on boot  :(

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