Forum Discussion
I ran into the exact same issue in my lab environment. I'm currently running BIG-IQ 5.1 and version 12.1.2 on my BIG-IP running LTM.
My problems started happening after upgrading the REST Framework using the instruction: Installing required BIG-IQ system components that's in the BIG-IQ Device Device Management Guide.
What solved it for me was to actually re-install TMOS on a new partition and boot into that one without copying the configuration.
Before doing that I tried to reset restjavad to its factory settings. This is done differently between each version. Check out this guide: https://support.f5.com/csp/article/K15886
Are you experiencing problems when importing the configuration?
If the F5 supports find the issue please post in this thread.