Thinkpads Forum

Topic says it really - I have a T61p which reports its BIOS version as 2.30, which is also the latest (last!) on Lenovo's site.

Should I "downgrade" to Middleton 2.29?

Cheers,
Howard

I would still use Middleton's BIOS. The only change in Lenovo's code between 2.29 and 2.30 is "Added support for the new Conexant audio chip."

Middleton's BIOS adds:
SATA-II speeds
No Wi-fi whitelist
SLIC 2.1 (for activating Windows 7 OEM)
IDA support
Fixes "Thermal Sensing Error" when installing Penryn CPUs on older boards

None of the Lenovo BIOSes do that.

Thanks, I'll give it a go (while making sure I have 2.30 downloaded in case I have to go back!

Cheers,
Howard

So thankful for these modified BIOSes. I always remembered how incredible this feat was when they came out.

I just opened up both my X61 and my modified T61p from storage and man what a dream that generation's of keyboards were!! They also run Windows 10 like a champ and 11 (you can bypass the TPM check per MS's site) *should* run just fine.

While BIOS 2.22 was the last one for the X61 and it runs like a dream with Middleton's modified BIOS, I often wondered if the T61 2.30 BIOS, that was never modified (I had asked Middleton at the time, but he didn't want to), ever fixed the DPC latency issues that the T61's were plagued with...

That said, if anyone know of a modded 2.30 BIOS that someone picked up and modded, I'd be interested to give it a go and see if it's related at all or just the modem-related shenanigans we spoke of in the past...

First convince yourself you can flash just the BIOS (*.fl1 file) using phlash16 for the middleton 2.29 BIOS. Then flash the 2.30 BIOS, check your issues, then revert to the middleton BIOS. If it does fix what you want, you can induce someone to mod the 2.30 BIOS for you.