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

FAP-U431F and FAP-U433F running firmware version 6.2.2 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.

Administrators who use FortiGate or FortiLAN Cloud to manage FAP-U431F and/or FAP-U433F units must upgrade them carefully using the following steps:

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 from the support site.

3. On FAP-U431F and FAP-U433F units running the special build 4001, continue to upgrade them to FAP-U 6.2.2 GA build 0267.

   You may receive a downgrade note on the FortiOS GUI when upgrading from build 4001 to build 0267. This is due to the 0267 build number being read as a lower version number than build 4001. The process is not a downgrade and the note can be ignored.