DescriptionThis article describes how to go about - Unable to upgrade FortiAP via FortiGate GUI due to 'Image file doesn't match platform' error as shown below:
FortiAP upgrades via FortiGate does not work.
Debug (possible cause and fix).
1) Ensure FortiAP firmware used is a valid image and belongs to right FortiAP model.
2) If FortiAP firmware image is correct, try FortiAP upgrade via FortiGate GUI using other web-browsers such as Microsoft Internet Explorer/Edge/Chrome/Firefox.
3) There’s a similar Bug 0479692 – where FortiGate GUI prompts an error 'Image file doesn't match platform' when User is uploading correct FortiAP image on FortiGate GUI – this Bug is fixed in FortiOS v6.0.8 and v6.2.2 and later versions.
4) If FortiGate upgrade is not an option then try upgrading FortiAP units from as shown in 'related articles'.
FortiAP unit firmware upgrade.
Technical Note: Upgrading FortiAP Firmware