See the full list for Airport router’s required OS X and Software requirements. Apple periodically sends update for Airport Base Station: Air Port Extreme, Air Port Time Capsule, Airport Express, Air Port base stations.
Getting inside the Air Port Express itself was tricky.
For the Open Air Port Utility on Mac Display badge for connected Air Port device in your network if firmware available for update. Note: Downloaded Air Port Firmware saved on Mac, ~/library/Application Support/Apple/Airport/Firmware.
When you open Airport Utility on Mac from Applications/Utilities folder, Airport utility will display badge to the right. Sure about you are connected with internet, Open Airport Utility App from i Phone/ i Pad.
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.