So I ran into that bug and am trying to do this install/upgrade remotely - so I can't use the 6.1 ISO. TAC said their is is 6.1 upgrade from 5.x. They sent me to Customer Service who opened a ticket...etc
48 hours later I call and am told there are no updates. I escalate and get put on hold for 90 minutes and hang up.
At this point I want to know if anyone knows for sure if there isa 5.x 6.1 upgrade file or if a flat install via the ISO is required. Any help in this matter will be appreciate since I'm really behind schedule now and Cisco Customer Support is being difficult.