There is no word on what's included in the firmware, but given that these are all older models, it is likely that the new firmware includes bug fixes and other minor improvements.
Apple doesn't have a way to manually upgrade AirPods software, but firmware is generally installed over-the-air when the AirPods are in a charging case and connected to an iOS device or Mac.
This article, "Apple Releases New AirPods Pro, AirPods, and AirPods Max Firmware" first appeared on MacRumors.com
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