brute force with 11 length password(MD4)

[Athlon64]

I don't agree that "H", "K", "M" and "P" are lowercase characters.

It's probably also not the best idea to mask attack such passwords (there are some exception, e.g. if you know that those passwords are not user-choosen and/or randomly generated, but that's even worse for the cracker).
There exists more clever/advanced attack modes for human choosen passwords like rule based attacks etc (see https://hashcat.net/wiki/)

Password length 11 is already very long, even for MD4 ! it's not very feasible to just "brute-force" it.

Ok, could you please make a suggestion to try ?