By default there is NO username and password, you should just get access to the console with full manager rights.
If you used the 'setup' command for initial configuration, it asks for a password and will set that to the username: manager. So if you have a clue what password could be set, you might try that with username "manager".
If you don't know the password, follow the reset procedure (that removes the configuration): http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=mmr_kc-0127335
.. and you may need to wait 25 seconds instead of 5 for the 5412zl according to http://h20566.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=5179499&docLocale=en_US&docId=emr_na-c02597269