Hi,
My name is John, I'm a cisco engineer.
I understand your concern, let me provide you a link, this link will provide you information on how you should do the upgrade on a failover device.
http://www.cisco.com/c/en/us/support/docs/security/asa-550...
Hello Sam Pace
After reviewing your question, I would highly recommend you to contact our Entitlement team, they will help you with this subject.
The number is 1-866-606-1866 Small Business Support Center
I hope this works