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Remove all previous firmware updates Air Port Utility will store the downloaded firmware updates on your Mac in a folder within your user library.If for some reason the firmware update has been corrupted when downloading or is inaccessible to the utility, then you may get an error.Scroll down that page to the heading "If you can't select your startup disk or start up from it".Do this each time you want to start up from the device or from a startup disk connected to it.If you're using , you can disable this security feature and allow your Mac to load Option ROM firmware automatically.
The 7.7.8 update applies to 802.11ac base stations, while the 7.6.8 update is available for 802.11n base stations.
You must update your Air Port base station using Air Port Utility on your Mac or an i OS device with the free Air Port Utility app installed (the download isn’t available via the Apple Support Web page or Software Update).
A few people are reporting problems with these updates, although it’s hard to know how widespread they are.
Firmware update 7.7.8 is recommended for all Air Port Extreme and Air Port Time Capsule base stations with 802.11ac.
Apple has issued an update to its Air Port Utility application for the Mac, introducing a new user interface that looks a lot like its Air Port Utility app for i OS.
Go to the /username/Library/Application Support/Apple/Air Port/Firmware/ folder and remove any files within this folder.