Avaya/Nortel Baystack ERS 5510/5520 firmware upgrade from v5.1 to v6.3.6
First of all, you CAN NOT do a direct firmware upgrade from v5.1 to v6.3.6. You must apply intermediary updates one at a time. Upgrading a Nortel / Avaya Baystack ERS 5510/5520 firmware from v5.1 to v6.3.6 requires several steps….