Apple today released updated 7.8 firmware for 2012 802.11n AirPort Express models, introducing support for AirPlay 2.
The new software can be downloaded onto compatible AirPort Express devices using the AirPort Utility app for iOS devices.
After downloading the firmware update, AirPort Express users have reported being able to target the AirPort Express right alongside other AirPlay 2 devices when running iOS 11.4.1 or iOS 12. With the AirPlay 2 update, 2012 AirPort Express models offer support for multi-room audio and are able to work with other AirPlay 2 devices such as the HomePod, the Apple TV, and Sonos speakers.
Read more at MacRumors.com