How can i do this

[droidman]

in hashcat lite i was trying to crack a mysql5 password and after a few days of no progress i tried to create one hash of my own, in mysql and sha1 and the default crack method could not crack it, i belive that i have to use a mask.
i thought that the bruteforce method covered all the possible occurrences but i created the simple password "AAAa" and no luck at all.
Please help me understand this.
For example, how can i try to crack a password that can have all uppercase, or lowercase, or digits or special characters from 1 to 8?

Thanks in advance