7.2 ADOM managing mixed FOS versions 7.4.1

This information is also available in the FortiManager 7.4 Administration Guide: Using Mixed Versions in ADOMs

When a 7.2 ADOM is managing mixed FOS versions (FortiOS 7.2 and 7.4), the ADOM can be upgraded to version 7.4.

• When FortiManager is managing mixed FortiGate units running on FortiOS 7.2 and FortiOS 7.4 in an 7.2 ADOM, FortiManager allows you to upgrade the ADOM from 7.2 to 7.4 before upgrading all FortiGates in the ADOM to FortiOS 7.4.
  
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• In the upgraded 7.4 ADOM, you can create new 7.4 firewall policies and install the policy to both FortiGate devices on FortiOS 7.4 and 7.2. FortiManager's backend system automatically downgrades the 7.4 syntax to the 7.2 version when installed to a FortiOS 7.2 device.