Most of the firmware for Emc Brocade connectivity supported switches is currently listed in the following location.
If your unable to get the firmware for EMC supported switches on the Emc website listed above please refer to the knowledge base article below.
Connectrix: How to obtain old firmware versions for Connectrix Switches
If you use Primus ref emc220383.
One other helpful tool when doing upgrade's on the Emc connectivity supported switches is the procedure generator which can be downloaded from the website.