I am migrating from ASA5550 (running 7.2(4)33) to 5580-20 and was intending to use the same version. A second phase of the project will include image upgrade. By looking at the image available for download from Cisco for the ASA5580 it only shows up 8.1.X and higher. Does it mean that ASA5580 does not support lower image versions ? AS always your help is much appreciated.