I need to download a later IOS release for the two ASA 5520s I have. I've been to Ciscos website and used the IOS selector tool, but get way too many options than I have knowledge to sort through which IOS release I need. I know I need to upgrade the ASDM software because the JRE version the current version uses is outdated. I just don't know if I need to upgrade my IOS version and the ASDM both or just the ASMD. I need to have VPN support w/IPSec, but don't know what IOS to select?
Cisco Adaptive Security Appliance Software Version 7.2(2)
Device Manager Version 5.2(2)
Java Version 1.4.2_18