Special notice

FAP-U431F and FAP-U433F firmware version 6.2.2 requires a mandatory change in data partitions, so they can NOT be directly upgraded from 6.2.1 to 6.2.2 or later versions. If your FAP-U431F and FAP-U433F units are currently running firmware version 6.2.1 or earlier and are managed by a FortiGate or FortiLAN Cloud, follow the instructions below to upgrade them.

FAP-U431F and FAP-U433F running firmware version 6.2.2 and later can no longer be managed by FortiWLC. A factory reset will reset FAP-U431F and FAP-U433F to the default configuration for FortiGate and FortiLAN Cloud management only.

1. Ensure your FAP-U431F and FAP-U433F units are running FAP-U 6.2.1 GA build 0237.
2. Upgrade them to the special transit images FAP_U431F-v6-build4001-FORTINET.out and FAP_U433F-v6-build4001-FORTINET.out respectively, which are available in the FortiAP-U 6.2.2 image folder on the support site.

3. On FAP-U431F and FAP-U433F units running the special build 4001, continue to upgrade them to firmware version 6.2.6.

   You may receive a downgrade note when implementing step 3 on the FortiGate GUI. This is due to the special build number 4001 being read as higher than the GA build number. The process is not a downgrade and the note can be ignored.