FortiAnalyzer Default Reports and Charts Missing After Downgrade

The solution for this problems is fairly straight forward and documented but must be modified when remote access to the system is all that you have.

First, backup your system.  This is not required but the solution requires the internal disk to be formatted.

Next, execute the following CLI commands:

execute reset all-except-ip

execute format disk

This will allow you to still have access to the system after the reset and formatting are complete.  Once this was accomplished, my reports and charts were restored.