There may be some AAA statements causing this. Did you try SSH, telnet and console? If you are locked out of all three, I would recommend opening a support case and one of our engineers can help you recover.
I believe the upgrade is to 8090 release. Beginning this release, ICX has a default username and password and has the SSH turned ON by default. The default credentials are super (for username) and sp-admin (for password) when you are trying to access the switch using SSH/Telnet/Console/Web. Once you are in, aaa settings can be removed to open up access to the switch.
I was just going to say that. If it is not updated to 08090, then you need to do a password recovery. If that is the case, press 'b' to interrupt boot and type "no password" without the quotes. Then I believe it is just 'boot'