Sorry for the late reply but I ended up replacing the NVRAM region of my BIOS dump from a fresh BIOS, re-flashed it and it worked. Thank you everyone, a special thanks to hoaca388....

How can I reset the setting that I made in the BIOS in this dump, I think I need to clear the NVRAM but I don't know how to. Can someone guide me on how to clear the NVRAM in a Lenovo BIOS?

hoaca, please upload the correct file.

Comparison attached in my next post (#14).

I tried comparing the both files and found out that some entries in Intel Image-->ME region-->MDES have changed (images attached). Is this normal?

P.S. MDES is ME debug event service....

I tried reading the bios chip again today (file attached) and guess what? The MD5 sums of this file doesn't match with the previous dump that I created yesterday and it is quite confusing for me. Am I not installing the adapter clip correctly or have the contents of chip changed overnight?

P.S. CR2032 coin cell battery is not installed in the motherboard....

I think it's some kind of script, I opened it with notepad and it looks like a script to me...

Is there a problem with my dump? I already went through this page...

Can't interpret what you are trying to say and what to do with this file (I am newbie in the bios field)?...

Is there a way to reset/change the bios settings to default in the bios dump file and re-flash the dump with changed settings? Will it work?...

I don't have the backup bios file but I tried reading the bios chip using CH431 mini programmer, not sure if was a good read or not so I did it twice. Dumps attached (could not upload .bin so uploaded .zip containing two dumps).

P. S. Suspected bios chip located (please confirm by looking into the dump contents), It's a MX25L12873F...

Here are the details of my machine (Lenovo Thinkstation P500)
Processor: Intel Xeon E5-1650v3
RAM: 2x8GB DDR4 2133MHz
GPU: AMD R7 250 1GB
Machine Type: 30A6
S/N: PC0APW73
Motherboard: Lenovo Scorpius rev. 1.0
BIOS Version: A4KTACA...

Hello all,
I have a Lenovo Thinkstation P500 that is stuck at post with no display, it happened after I changed the memory timings in bios. I can not clear CMOS using the jumper on the motherboard, also tried re-flashing bios suing a USB stick but it also doesn't work. The only solution that I can think of right now is re-flashing the bios chip using an external programmer but the problem is that I don't have the bios dump of p500 for flashing externally and I don't know the location of bios chip. If someone can provide the bios dump and bios chip location it would be really helpful....