I used https://github.com/gurnec/btcrecover a while back. Does this person have any idea what the passphrase is?
Discussion
The likely options came up empty. This is the hail mary.
I tried 80 different iterations. It turned out I had an extra space in my passphrase. The python program makes it faster.
This problem is the main reason I recomend using the Cold Card.
This looks useful. 🙏
I'm going to have to play with this when I know for sure it's going to find something. Then I can try it again with a less certain test.