lenovo T420 whtelist by pass possible???

5 réponses [Dernière contribution]
newlinuxuser
Hors ligne
A rejoint: 01/03/2019

Hey everyone, im new here and this is my first post, (yay me :p) I've been searching for a laptop for a long time and decided to go with a t420, because of the ability to upgrade, (and the price was right $120).

thus this brings me here. iv been rooting around and searching for the past 2 days i came across this reddit thread
https://www.reddit.com/r/thinkpad/comments/5jicwh/flashing_a_custom_bios_onto_my_t420/
(second post mentions taping te 20th and 51st pins)

what I want to know, does anyone have a lenovo t420, with a wifi card that is supported by trisquel possibly in another laptop to try the idea of taping the 20th pin and the 51st pin and see if this will bypass the whitelist? im trying everything i can so i dont have spend money on a usb wifi card.

Cheers

Beformed
Hors ligne
A rejoint: 01/12/2017

Hello newlinuxuser,

I have a T420 with a wifi card that supports fully free software. My method of doing it was to flash coreboot on my unit (I did it all myself), I don't know about tapping pins. The benefit of corebooting was the fact that I could reduce the Intel ME.

Cheers

newlinuxuser
Hors ligne
A rejoint: 01/03/2019

ah fair enough, how did you flash coreboot yours? iv been looking online and cant find the right info, or for that matter info i can actually trust.

nadebula.1984
Hors ligne
A rejoint: 05/01/2018

An external programmer is required. Basically, you'll need to compile a coreboot firmware image, then disassemble your notebook and flash the firmware image externally.

Beformed
Hors ligne
A rejoint: 01/12/2017

I'd recommend to start checking on this webpage, it describes how to coreboot a thinkpad x220 (https://karlcordes.com/coreboot-x220/) but it applies to the T420 except the part of disassembly, to do that you can check this nice guide Lenovo put together https://support.lenovo.com/us/en/solutions/pd009006. I used a beaglebone black but if you have a raspberry pi you should be fine as well as mentioned on Karl's procedure.

Cheers

nadebula.1984
Hors ligne
A rejoint: 05/01/2018

For UEFI-based ThinkPads, the white list restriction is a loadable UEFI module. Since T420 doesn't have Boot Guard, it's very possible to remove the white list restriction.

The easy way is to download an official UEFI firmware image. Then edit it and remove the white list module.