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Solved: How do I upgrade FAP-U431/U433 from 6.2.1 to 6.2.2?

This article describes about the upgrading steps of FAP-U431/U433 from 6.2.1 to 6.2.2. 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.


  • FAPU431/U433F version 6.2.1


Step 1: Ensure the FAP-U431F and FAP-U433F units are running FAP-U6.2.1 GA build 0237.

Step 2: Upgrade them to the special build FAP_U431F-v6-build4001-FORTINET.out and FAP_U433F-v6build4001-FORTINET.out respectively, which are available from the support site.

Step 3: Once upgraded to special build, Upgrade to the 6.2.2 GA build 0267.

Warning: 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.

Firmware download link:



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