Just in case Eric's suggestion doesn't work...
...It's a while since I played with my 585 V7, but I seem to recall that the default password was, at some point, the router's serial number as printed on the label on the back. Not sure whether that was something it generated during installation, or if that's the way it left the factory. I never tried flashing it so don't know what effect that has on passwords.
As Eric stresses, watch out for the capital A on username. Being linux inside, it's naturally case-sensitive and same applies to any letters that appear in the serial number.