force factory rest of sfs7000 (topspin 120)

We have a cisco sfs7000 (maybe still under support waiting on cisco) also known as a topspin 120, IB switch. We cannot login with the password we (thought) had it set to. I have looked online and find little tonight about forcing the switch back to factory defaults without a login. Serial console works fine, just can't login. We can screw in firmware a little by stopping boot, just don't know what to do from there. If ...