I have a Cisco Firepower and I am upgrading from FTD 6.3.0-83 to
220.127.116.11 managed locally on FDM.
The upgrade has been successful however the FDM manager is not starting with the error FDM application error and cannot be started.
Can someone help me ?
Verify that local management is still set from the cli using "show managers".
If it is still set and not coming up then I would recommend opening a TAC case as you are hitting unexpected behavior most likely due to a bug or corrupted configuration.
You can reimage the appliance from scratch by following this procedure: