Thanks to Apple’s free AirPort Utility app for iOS, it’s easy to make simple changes to your Time Capsule and update its firmware without having to use a computer. Here’s how to update your Time Capsule firmware using only your iOS device and the AirPort Utility app.
Now tap on the ‘Version’ tab. AirPort Utility will tell you whether there’s a firmware update waiting for your Time Capsule.
If a firmware update is waiting, simply tap the ‘Download and Install’ button to begin the installation process, then tap ‘Install’.
The update will now be downloaded and installed onto your Time Capsule, and you can keep an eye on its progress within the AirPort Utility app. It’s worth noting that once the update has been downloaded and installed to your Time Capsule, it will reboot itself and you will lose your network connection temporarily.
Once it starts back up, your Time Capsule should now be running the latest firmware..