Apple on Tuesday released an updated firmware for a small subset of available AirPods audio devices, including the AirPods Pro (1st generation), AirPods 3, AirPods 2, and AirPods Max (Lightning). That firmware has been dubbed version 6F21 and is a step above the version 6A326 firmware that came before it.
Apple pushes AirPods firmware update 6F21 for several older models