There was no a way ( at Brocade Time ) to Reset boot proom password, excepted with a active support and maintenance contract, below a procedure how to Obtaining the Recovery StringCAUTIONEnter commands at the Boot PROM interface exactly as shown. Inc...
whitout any kind of warranty..... otherwise ignore my post.
in order to delete any registered chassis, as fair as i remember, you have first to romove it in VCS.
example form a command reference manuals:
vcs logical-chassis enable default...
from output above, just a stupid question..... did you have AAA authentication configured ?
if yes, try follow. disconnet the LAN cable from management port, wait for 20 minutes, connect a serial cable and try again.
as fair as I remember...