https://www.bios-mods.com/forum/Thread- ... er-changes
I know that the latest BIOS is 1.45 and it was released just after 1.44 because of the Meltdown/Spectre issues but there only seems to be one person that modified the 1.45 BIOS and he/she/it is attempting to sell it instead of just offering it people so, I guess I won't be getting that one anytime soon unless someone else decides to offer a modded BIOS.
Note that for this 1.41 modified BIOS you must install the Lenovo supplied stock 1.41 first and once that's done you can then flash the modified 1.41 on top of it. The T420s I just got actually had the 1.28 BIOS from many years ago on it so yeah, installing a whitelist free BIOS was important to me. I replaced the Intel 6205 Wi-Fi card with an Intel 6300 (Dell PN on it from my Latitude E6400) and now make use of the 3 antennas and get better throughput. I do intend to get an 11ac card at some point when I can find a good one. I read somewhere a few days ago that it is or might be possible to use a 7260 in the T420s just by taping or covering one of the card connectors (they're not pins but people call them that anyway).
Will have to do more research but, as stated, the 1.41 works for me so far, no issues noted, don't really care all that much about the Meltdown/Spectre situation to be perfectly honest. Since this is a much older laptop every little bit of performance matters so I'm not willing to lose a chunk of it just for that issue.
So unless I find a 1.44 or 1.45 (and there will more than likely be a 1.46 or something very soon since Lenovo is currently working on new patches for the Spectre offshoots) that has at the bare minimum the whitelist removal I'll stick with this 1.43 for the future.
I'm tempted to get into learning how to mod the BIOS myself actually, the removal of the WL, the removal of the RAM speed lock (didn't even know about that till recently), and unlocking some kind of AES-NI support as well and some other mods too are all potentially useful I suppose.
We'll see what happens... and if anyone requires or wants the 1.43 WL removed BIOS for the T420s drop me a PM.
EDIT: Of course 30 seconds after I made this post I did find a 1.44 WL removed BIOS but as stated I'll pass on it 'cause I'm not interested in losing performance for a bug that won't more than likely ever matter to me at all.
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My 420 upgraded fine to the latest as it has the OEM wifi card.
My 420s cant because it came with that rubbish Thinkpad Wireless II single band rubbish so I replaced it with a 6300.
The thing is, performance is still about the same, of course. I'm not using an VM s/w on it and the 2540 cpu has enough grunt to absorb the impact.
I would like the 420/420s WL bios for completeness however its not 100% necessary for most people.
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