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Downgrade bios from 1.41 for T420s

T400/410/420 and T500/510/520 series specific matters only
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segacleop
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Downgrade bios from 1.41 for T420s

#1 Post by segacleop » Fri Apr 08, 2016 11:55 pm

I have sadly learnt the it hard way, that Lenovo decided to block official downgrading from bios ver 1.41 for the T420s. Does anyone know of a reliable plan b procedure to downgrade the bios, all attempts to run official exe of older Bios files are met with errors pertaining to a different system etc. If anyone can help me out i'll be forever grateful.

segacleop
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Re: Downgrade bios from 1.41 for T420s

#2 Post by segacleop » Sat Apr 09, 2016 12:50 am

Figured it out, just flash the FL1 file using winflash and close your eyes and wait for a brick or a downgrade. I got a downgrade, my hatred for Lenovo is getting there slowly.

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Re: Downgrade bios from 1.41 for T420s

#3 Post by dr_st » Sat Apr 09, 2016 12:31 pm

I wonder how exactly they "block" the BIOS from being downgraded... By your evidence, it is not a 100% block.
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Re: Downgrade bios from 1.41 for T420s

#4 Post by RealBlackStuff » Sat Apr 09, 2016 1:42 pm

Lenovo is just trying to be as obnoxious as they can be (and it is quite successful with that!)
Look at all the BIOS-mods that are floating about!
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Re: Downgrade bios from 1.41 for T420s

#5 Post by Trexie » Sun Apr 10, 2016 3:19 pm

Sorry to ask this here, can i downgrade from 1.48 to 1.46 in a t420, can the method posted above work? Sorry for all the trouble

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Re: Downgrade bios from 1.41 for T420s

#6 Post by jwjensen356 » Sun Apr 10, 2016 11:58 pm

Sorry to butt in about the T420S but I have a newly acquired T420. It has a 1.37 BIOS. is there a particularly optimum one for an upgrade?

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Re: Downgrade bios from 1.41 for T420s

#7 Post by jaspen-meyer » Mon Apr 11, 2016 2:27 am

RealBlackStuff wrote:Lenovo is just trying to be as obnoxious as they can be (and it is quite successful with that!)
Look at all the BIOS-mods that are floating about!
Not everything which glitters is gold. Some of those bios mods are building botnets.
T420 i7 3612QM seabios; T420 i7 3630QM; T400 Q9100 seabios; T61 P9600; T60 libreboot; x62; x60s libreboot, led; x24 xiphmont led

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Re: Downgrade bios from 1.41 for T420s

#8 Post by Anonymo » Fri Apr 22, 2016 4:36 pm

segacleop wrote:Figured it out, just flash the FL1 file using winflash and close your eyes and wait for a brick or a downgrade. I got a downgrade, my hatred for Lenovo is getting there slowly.
Can you let me know what fl1 file to flash?

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