Basta abrir o Utilitário AirPort no iOS ou no Mac e a atualização aparecerá.
AirPort Base Station Firmware Update 7.6.4
– Resolve an issue that may cause AirPort Time Capsule to report that the backup disk is in use
– Resolve an issue that may cause an IPv6 Tunnel error
– Resolve an issue that may intermittently cause a loss in Wi-Fi connectivity with iOS devices
