Have you tried hashcat yet?
Wish you find your coins, good luck.
I've spent close to 250k since 2014 on this, so, yes.
Bruteforcing is no option.
Dave succesfully recovered a wallet holding +- 1800
BTC around the same time (lost all passwords the same day), so i know he's a capable guy.
If he tells me after almost ten years it's impossible using the bruteforce technique, then i trust him.
I guess i'll wait it out until our technology evolves.
Well, what I described has nothing to do with brute force, it's also not related to technology, it's a rather simple math equation.
I have heard and read about Dave's work, seems legit and secure to give him wallet hash, best way to crack a wallet's password without giving him access to the wallet if he can crack it.
But password recovery and elliptic curve operations are different, however a 256 bit key is not possible to solve currently.
Just a friendly advice, never spend money on recovery before calculating everything scientifically, always ask experts for precise calculations of success, time, odds, probability etc.😉