FDS-only ISDB package in firmware images 7.0.4
FortiOS firmware images include Fortinet objects in the built-in Internet Service Database (ISDB). This lightweight ISDB package allows firewall rules and policy routes that use ISDB to access FortiGuard servers to continue working after upgrading FortiOS.
After the FortiGate reboots after a firmware update, an automatic update will run in five minutes so that the FortiGate can get the ISDB, whether or not scheduled update is enabled.
For more information about this feature, see FDS-only ISDB package in firmware images.