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[REQUEST] Lenovo Thinkpad T420 (83ETxxWW) Whitelist Removal
If you're only interested in the micro code update for Meltdown / Spectre you may simply flash the original bios and then downgrade to your old modded bios without flashing the micro code using the following command in a cmd shell (with admin rights):
WinFlash.exe /v /cs /sd /sv /svs /vcpu $01C8000.FL1 (for T420 modded FW 1.46)

That's at least a workaround for Meltdown / Spectre till there's a working 1.50 mod bios.
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Hello all,

I just picked up a mint T420 and it is currently running BIOS 1.39.

As members have stated above I'd like to update to BIOS 1.50 but also remove the typical whitelist for wifi/wwan/battery etc, add advanced menu and restore RAM speeds.

I am new to this though, so would appreciate if any experienced members could offer me some assistance to complete this process.
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Hello,
I'd like to ask mod bios 1.51 for T420. Please. 1.51 is available in April.

2018 06 Aug
The BIOS is now 1.52. Would someone create the mod-bios ?
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hello
can you remove withelist wifi card of LENOVO T420
BIOS 1.48
link of backup rom
made with :universal Bios backup V2.0
https://mega.nz/#!r5lTkQCT!rmp5crrwJ84eb...M8SM7OyL8s
THANK YOU Smile
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Hei. Can anyone edit 1.51 BIOS and add
WLAN whitelist removed - can use any wireless card
1600MHz & 1866MHz RAM support
16GB RAM Support, stable with an eGPU

+ also remove SSD/HDD problem (I can use OCZ Agility 3, compatibility issue during booting)
and eventually add some features for OS X Support
MSR 0xE2 Unlock (Apple PM Fix)
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I am currently running BIOS version 1.49 (83ET79WW), will this mod work? Or do I need to request a new one?

I am wanting to install the Intel 7260 802.11 AC card but I want to make sure it'll work before I buy it.
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It'd be fantastic if the ThinkPad T420 BIOS version 1.51 could be modded to remove the WiFi whitelist. I didn't think before updating my BIOS and now I can't use an Intel 7260 AC WiFi/Bluetooth PCI-E card.


My version 1.51 unmodded BIOS, dumped (hope I've done this right and that it helps):
https://mega.nz/#!SORn2KxA!H4ePTHLRZvXuE...sNH_iT9AwM
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I tried to mod the current bios 1.52, but can't flash it after modification. It seems I missed something. Can somebody help me with it?
Shortly I made the following steps:
1. Got the bios package from the lenovo site
2. Unpacked the *.FL1 file and used phoenixtool to extract bios modules.
3. Modified the *.ROM file responsible for checking of the white list. (using ida and hex editor)
4. Then packed packed files into *.FL1 file once more using the phoenixtool
Then, when I tried to flash it using WINUPTP.exe /S option, the process fails with error 102, something about writing error
Tried to flash it using winphlash.exe program, which is also fails with some EFI error
(I also tried to use UEFItool for packing/unpacking the bios file, but with almost similar result)

May be there are more files, which should be edited in bios? Can somebody help me with the issue?

Edit:
I figured it out - the file environment.dll should also be patched to allow flashing of the modded bios. It works now.


Attached Files Thumbnail(s)
   
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Here are the modded bios 1.52. Modded only the part responsible for checking the whitelist. Use it at your own risk, it worked on my pc but I have no option to check it on another t420.


Link: http://rgho.st/7VphNmm2f


(03-04-2018, 01:18 PM)wsa69 Wrote: Ловите, парни, а то тут жмотяры какие-то. https://www.sendspace.com/file/pqr2lb
https://yadi.sk/d/2r8181GH3SzpH8

Спасибо, чел, очень выручил =)
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(08-17-2018, 01:48 PM)zmb Wrote: Here are the modded bios 1.52. Modded only the part responsible for checking the whitelist. Use it at your own risk, it worked on my pc but I have no option to check it on another t420.


Link: http://rgho.st/7VphNmm2f


(03-04-2018, 01:18 PM)wsa69 Wrote: Ловите, парни, а то тут жмотяры какие-то. https://www.sendspace.com/file/pqr2lb
https://yadi.sk/d/2r8181GH3SzpH8

Спасибо, чел, очень выручил =)

I've downloaded from zmb's link the mod Bios 1.52.  Formal 1.52 was not be  able to update since WinFlash64.sys didn't work on the latest windows10. So did this mod bios. I have extra HDD and old windows8pro DVD. I installed W8 and tried to update BIOS with the mod bios.  I was able to update seven T420 of my own(seven is seven, 7). I just kicked WINUPTP.exe under Administrator on the W8.
I answered yes for prompting replace the file .....FL1(?).  Half of my T420 group have Intel Wireless-AC 7260 Network Card. It seems working.
Thank you zmb. Big Grin Heart
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