FortiManager v4.0 MR3 does not provide a full downgrade path. For those users who want to downgrade to an older FortiManager firmware release, downgrade the system firmware via a TFTP server with the firmware burning procedure embedded within the FortiManager system boot-up menu. A full format of the system hard drives and system reset are required after the firmware downgrading process.

All configuration will be lost after downgrading the device, and the system hard drives will be formatted.