wpa/wpa2 brute force and mask attack

[mastercracker]

hi i want brute force all number with start 0912*******(all star has number)
i try this command but not work
?0?9?1?2?d?d?d?d?d?d

Remove the question mark in front of the numbers that you want to set.

Code:

0912?d?d?d?d?d?d?d