As explained above, quite a few times now:
1. I have a 12 word seed. It appears to be wrong. I suspect there is only one word (the 3rd one) that is wrong.
2. This is a problem I am helping solve for a FRIEND
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Updates:
I started a 'btcrecover' program to try bruteforce the broken words, but I have no idea how long it will take. (So far seems to be taking quite a while)
So this friends of yours lost his seedphrase? And you think that only 1 word that is wrong. Not to be rude or something, but how did you or your friend knew that the 3rd word is the wrong one? Does that mean you remember correctly the other ones? That is why you have to always save the unique phrase in somewhere safe but you could retrieve them whenever you want to. Piece of advice, always double check everything you've wrote down especially if it's an important things.
As for the tools to crack ethereum seed phrases, if such tools exist, don't you think it would make the wallets easier to be hacked by hackers..