trying to crack my bitcoin wallet hash

[devilnash]

passwords my brother had before are as follows:
7m8s6m3s
FgolkP_OOL
RhjilO
7m8s6m3s**
GlhkO_u

but none of them worked but on top of that he is certain the password was 9-12 characters long and for sure has a ( _ ) and a ( 7)

i had put the passwords and two confirmed characters in a word list but i guess that was not the correct thing to do?