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I've had this problem before, the solution is to make sure both the FMC and the Firepower Module has the same date and time, otherwise you will see the following SSL errors:
MSGS: 01-09 02:14:40 firepower SF-IMS[41915]: [41926] sftunneld:tunnsock...
You can only upgrade rommon to a new version; you cannot downgrade. To see your current version, enter the show module command and look at the Fw Version
Reference link:
https://www.cisco.com/c/en/us/td/docs/security/asa/asa98/configuration/gen...