Includes general fixes, compatibility updates and security improvements for Air Port Extreme, Air Port Time Capsule and Air Port Express base stations with support for the 802.11ac or 802.11n wireless-networking standards This firmware update includes general fixes, compatibility updates, and security improvements for Air Port Express, Air Port Extreme and Time Capsule models.
The Air Port Base Station Firmware Update 7.7.8 can be installed only by using the Air Port Utility from the /Applications/Utilities folder on your Mac.
Now that your Dyn Standard DNS zone is configured to receive dynamic updates from Apple devices, you can use the Apple Air Port Utility (v5.4.2 to v5.5.3) to configure dynamic DNS in the Apple device.
If you’re running Windows, you may have to download and install the Air Port Utility, here: support.apple.com/kb/DL1391, before continuing with setup.
Firmware update 7.7.8 is recommended for all Air Port Extreme and Air Port Time Capsule base stations with 802.11ac.