BIOS for t4x and t6x

Hello.  I have a T42 laptop that had XP and I have now upgraded to Linux Mint.  Unfortunately, the newest distributions of Linux require a CPU flag for Physical Address Extension (PAE).  The T42 does not have that flag natively.  This means I have had to use an older, longer-term-support distro.  The work arounds suggested by Linux are clumsy and frankly have not worked all that well. 
One thing I have notice in poking around for a solution is that the T61 can make a change in the BIOS which will turn on the PAE flag and allow the newest distros to be installed.  My question is would one be able to install the T61 BIOS on the T42 or would I be creating an expensive paperweight?
Are there other work arounds to altering the T42 BIOS or would I again brick my machine?
I have not had experience in editing those files and the machine works well enough for what I am doing so I may just leave it alone.  On the other hand if I am able to "easily" make some changes that would allow the latest editions to be used that would be welcome.  Thanks!
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The only way to get around the PAE/NX requirement on T42 would be to install a 533MHz CPU from T43 or R52 such as PM 770 or PM 780 which support PAE unlike their 400MHz counterparts, but they would work at a lower speed in a T42 board, unless a pinmod is performed.
While all of the above is doable, I'd advise against it. There are many distros that will run just fine on a T42 "as-is".
I'd never attempt to force a T61 BIOS on a T42...TuuS' remark is right on the money there. If it's doable by some crazy chance, it will most certainly be deadly.
T61 has no such limitations even with the weakest/oldest CPUs that shipped in it and supports PAE/NX "out of the box".
Good luck.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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