Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

[saygi]

Hello, everyone.

I've brought this laptop of gumtree it was sold under 'spare or parts' the only issue with the laptop was it tends to heat up after 2-3 hours and decrease in performance.

because it did not come with a hdd I could not test it there, so I've installed a hdd and put windows 10 on it, I've used it for 5 hours and it did not heat up or decrease in performance however it turned off and displayed a message saying this laptop is disabled. I couldn't enter bios or boot windows at all. so I removed the hdd and reinstalled windows again and the message is gone.

I've contacted lenovo becuase it was still under warranty but they told me this laptop was reported as stolen and they could not help with disabling the Computrace (Absolute Persistence Module )

I've tried ubuntu and used it for 2 days and it did not turn off to display the message, so is only windows.

does anyone know's how can I disable the 'Absolute Persistence Module' in bios.

thanks in advance.

[Maxpower3]

Re: Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

https://www.badcaps.net/forum/showpo...90&postcount=8
to see if it works on your model

[saygi]

Re: Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

I can enter the bios and bios does not have password, this tools are for removing passwords from bios if im not mistaking.

[Maxpower3]

Re: Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

I can enter the bios and bios does not have password, this tools are for removing passwords from bios if im not mistaking.

https://www.badcaps.net/forum/showpo...postcount=2572

[saygi]

Re: Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

I'm a bit confused, I've downloaded and extracted the bios from the .exe file from lenovo's website for my laptop.

I'm guesing this two files are the bios '$0AN3500.FL1' and '$0AN3500.FL2' the FL1 file is 17.4MB the FL2 file is 256KB

do I just need to rename the .FL1 to .bin and follow this tutorial https://www.badcaps.net/forum/showpo...10&postcount=3 which is for different model

[mcplslg123]

Re: Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

Compare the size of original bios and .FL1-its not same. You need to compare both these bios in hex editor and cut the extra garbage from fl1 file to match it with your original dump. Else ask for bios in "Bios section" while posting your original backup.

[saygi]

Re: Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

thanks for that info, how do I extract the bios from the laptop the guides I found online it only shows how to extract the bios from the .exe file.

[mcplslg123]

Re: Lenovo ThinkPad T14s Gen2 Disable Absolute Persistence Module

You need a SPI programmer to read your bios chip.

[saygi]

sorry for the late reply, I've ordered 'CH341A USB Programmer' , and I've practiced on my other old laptop 'lenovo x220' ,

I had trouble reading the bios with the clip , I've removed the bios chip and soldered it on the ch341a which worked and I successfully extracted the bios.

the bios chip was easyly to fiind on the x220 , however I cannot find it on the t14s gen 2 HT4B1/HX3B0 NM-D362 Rev : 2.0 does anyone knows where it is located.

thanks in advance.

[saygi]

I think I've found it was behind a metal shield it's gigadevice and there are two of them there

AJ2146
25B256DYIG
UH1621

AJ2146
25R256DYIG
UH3835

are they both part of bios.

[OntarioTL]

So I had in possession some Lenovo T14s Gen 20WN laptops that had Absolute Persistence enabled and locked. So I used the usual editing of the BIOS to unlock the AP feature.

However, one pooped out on me when it tried to go to Self healing mode in which the other 4 did and had no issues. This one started flashing the LED's on the keyboard and whatnot. Just wont work. I tried flashing the original BIOS back and while it worked to POST, as soon as I loaded Windows, it crapped out again.

So I attempted to clean the ME with the bios to see if it was something there that was the problem. No go.

I'm going to keep working on it, but if someone can have a look at the BIOS files I attached and see if I am missing something. I have included the clean ME BIOS file, both U2202 and U2201 (is this where the self healing is located?)

Lenovo T14s Gen 2 20WN-S1BB00
Serial # PC24QCZ7

[mon2]

This is the wrong forum for bios requests. See above for the dedicated BIOS sub-forum.

[SMDFlea]

This is the wrong forum for bios requests. See above for the dedicated BIOS sub-forum.

Moved thread to bios requests

[saygi]

sorry, for the delay post update.

I'm attaching the extracted bios from chip 'GD25R256DYIG' , not from 'GD25B256DYIG' because I don't know if I need to extract from both of the chips or just one or if this laptop has dual bios. if anyone can help to remove 'Absolute Persistence Module'. many thanks.