On the FortiGate 7000E platform, after upgrading firmware from 7.2.8 to 7.4.x, the CLI of the secondary FIM and the FPMs in the secondary chassis of an FGCP cluster may display This firmware failed signature validation. The firmware is valid and the FortiGate 7000E cluster will operate normally. On the FortiGate 7000E platform, after upgrading firmware from 7.2.8 to 7.4.x, the CLI of the secondary FIM and the FPMs in the secondary chassis of an FGCP cluster may display This firmware failed signature validation. This error message is displayed because of a known issue. The firmware is valid and the FortiGate 7000E cluster will operate normally.