Not long ago I faced an issue with Cisco Firepower module. The upgrade failed and when I tried to rebuild SFR, different errors were showing up preventing me from going any further.
Based on Cisco documentaion you will need 3GB of diskspace to deploy a new SFR and that was exactly the problem.
Install and Configure a FirePOWER Services Module on an ASA Platform:
https://www.cisco.com/c/en/us/support...
#cisco #firepower #asa