DoCNC, I have to say --- why? Just use the exact proper version, there are many available, just use badcaps search, I've seen them. Especially warm & fuzzy when you find one that someone has posted back something to the effect of "works for me".
Oh, and BTW, physical appearance has nothing to do with it. They could look exactly the same and have totally different bioses and often do.

DoCNC[USER="331195"]DoCNC[/USER]
You got it!
I'm not expert enough to tell you...

@DoCNC,
See these posts:
[URL]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/78215-lenovo-bios-auto-patcher-for-supervisor-password-removal?p=3619031#post3619031[/URL]
[URL]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/78215-lenovo-bios-auto-patcher-for-supervisor-password-removal?p=3619126#post3619126[/URL]
[URL]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/78215-lenovo-bios-auto-patcher-for-supervisor-password-removal?p=3634528#post3634528[/URL]...

Just about any hexedit type program will search for hex or ascii code for you, you'll find the version in there. Here's my 1.65 info embedded in the bios. The LENOVO just before is the only place, at least up until that point, where LENOVO appears in all caps in my bios, might be a good thing to look for if you're not sure of the bios version string you are searching for:

[CODE]002365E0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 15 DC 01 00 D4 00 02 00 00 00 CC 00 00 00 01 00 00 00 4C 45 ..................................LE
00236604 4E 4F 56 4F 00 FF FF FF FF FF FF FF FF...

I agree with you 100%, it's equally possible Lenovo did it inadvertently or intentionally, but whatever the case, it's what solved my problem too. I did the same as you, immediately on receipt of laptop I updated to the newest bios, like the old days. Those days are gone, I won't do that anymore. I got a good dump and patched it, it wouldn't work, 4 days, countless hours I spent on it. Then I downloaded an older bios, patched it and in one try, it removed the SVP. Then I put MY bios back on, all good.
So if you're getting the black screen, nothing happening thing, it's likely your...

Are you trying to read it using a clip? They are extremely unreliable....

@[B][URL="https://www.badcaps.net/member/624511-xargon1975"]Xargon1975[/URL][/B]​
See [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/78215-lenovo-bios-auto-patcher-for-supervisor-password-removal?p=3611060#post3611060"]my post[/URL], I spent 3-4 days and many hours to come to that successful solution. Especially if you have a newer bios. T480 pretty popular, bet you can find a dump somewhere, it's only to remove SVP and then you go back to your original...

I have successfully used the EZP2019+ to read and program my MX25L12873F. And successfully added it to the definitions table. [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/78215-lenovo-bios-auto-patcher-for-supervisor-password-removal?p=3611060#post3611060"]Please see this post for details[/URL].I have successfully used the EZP2019+ to read and program my MX25L12873F. And successfully added it to the definitions table. [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/78215-lenovo-bios-auto-patcher-for-supervisor-password-removal?p=3611060#post3611060"]Please

In the interest of helping others I'd like to share my successful experience removing the SVP from bios of a Lenovo P51.
I used the clip throughout and clearly it is just as unreliable as everyone on the forum says. I recommend to not hurry through that 1st bios dump, if you mess it up you'll be sorry. My bios chip is the MX25L12873F and I used the EZP2019+ programmer. That chip is not supported on this programmer, but it does have the ability to add it to the definitions. There's a weird menu at the top of the programmer program, click on "Device (y)", it will take you to the...

Hi. Long time electronic technician/electrician/computer enthusiast (and I do mean a LONG TIME!). Started out on the Radio Shack Trash-80, some of you still know what that was, in the mid-late 70's. Seen a lot come and go, still remember hooking up that 5MB hard drive (who'd ever need more than that!) but never thought I'd see the day when bald-faced planned obsolescence became the norm. I thought it was just cars, John Deere, no, it's everywhere. I messed around with modified bioses 20 years back, guess that was kiddee school, but I'm catching up quick, just brought my lenovo P51 back from...