https://wccftech.com/airport-express-appears-in-the-home-app-once-again-in-ios-12-beta/

Previously before Apple decided to release its iOS 11.4 firmware update to the public, it was discovered that the AirPort Express was an accessory for AirPlay 2 devices with the stock Home app. This raised the notion the the the AirPort Express will be a working AirPlay 2 accessory even though it has not been updated for several years. However, a little while after it was discovered, it was removed from the stock Home app. Now, user’s hopes have come up again as the AirPort Express is listed in iOS 12 beta once again inside the Home app. So let’s dive in to see some more details on it.

Currently, the iPhone and iPad are resting on iOS 11.4 which was announced a while back. Now, we have also come to know that Apple has stopped signing iOS 11.3.1. This means that users can no longer downgrade to the previous version if they have updated their devices to iOS 11.4. This might be a major disappointment for users interested in jailbreaking their devices. We have covered the release of iOS 11.3.1 jailbreak and it’s bad luck for you if you have updated to the latest version.