Apple released firmware for first-generation AirPods Pro and second-generation AirPods. Version 6A321 matches the previous week’s AirPods 3 update and replaces the 6A300 firmware from September.

AirPods firmware releases rarely include detailed feature notes, so the software’s changes remain unclear.
Apple’s release notes for the previous week’s AirPods 3 update listed only bug fixes and other improvements.
Apple does not provide manual AirPods firmware update instructions. Updates normally arrive over the air while AirPods are connected to an iOS device.