When we try to configure "Dynamic Botnet List Server" we get an error "Error: Dynamic External Group Name: failed to edit as modifyIndex = 0"
This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.

In order to resolve this:

NOTE: Please make sure that deag objects are not used anywhere( like in access rule or Nat policy ) since all DEAG objects will be deleted and botnet config will also be reset.