This update:Apple has also released a 7.7.7 update for its 802.11ac Wi-Fi Base stations, including the latest AirPort Extreme and AirPort Time Capsule models. It fixes the same issues.
- Fixes an issue which may prevent communication between clients on the same network
- Improves performance with an extended guest network
- Addresses potential naming conflicts with Bonjour Sleep Proxy
The firmware updates can be installed through the AirPort Utility app for iOS or OS X.