I purchased the FTD2110 back in October and upgraded the software to allow BGP, version 6.2.2. Then after a few months the perpetual license unregistered. I just need the base license for the device currently, do I need a service contract or can I use my smart license account to create a token for it (tried and it would not take)
What license specifically are you seeing as expired?
A Firepower 2110 running the FTD image has the option of Threat Defense, URL Filtering and Malware licenses - all of them term licenses of 1, 3 or 5-years.