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Downgrade bios from 1.41 for T420s
Posted: Fri Apr 08, 2016 11:55 pm
by segacleop
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.
Re: Downgrade bios from 1.41 for T420s
Posted: Sat Apr 09, 2016 12:50 am
by segacleop
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.
Re: Downgrade bios from 1.41 for T420s
Posted: Sat Apr 09, 2016 12:31 pm
by dr_st
I wonder how exactly they "block" the BIOS from being downgraded... By your evidence, it is not a 100% block.
Re: Downgrade bios from 1.41 for T420s
Posted: Sat Apr 09, 2016 1:42 pm
by RealBlackStuff
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!
Re: Downgrade bios from 1.41 for T420s
Posted: Sun Apr 10, 2016 3:19 pm
by Trexie
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
Re: Downgrade bios from 1.41 for T420s
Posted: Sun Apr 10, 2016 11:58 pm
by jwjensen356
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?
Re: Downgrade bios from 1.41 for T420s
Posted: Mon Apr 11, 2016 2:27 am
by jaspen-meyer
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.
Re: Downgrade bios from 1.41 for T420s
Posted: Fri Apr 22, 2016 4:36 pm
by Anonymo
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?