Apple has updated the firmware for several older AirPods models. The new firmware revision is 6F21, the prior firmware was 6A326. The affected models are as follows: AirPods Max (lightning only)

It’s everything but the new AirPods 4, the AirPods Pro 2, and the USB-C version of the AirPods Max. Apple stopped updating the original AirPods firmware some time ago, as it was discontinued and replaced by 2nd-generation AirPods (now called AirPods 2) in 2019. According to Apple’s AirPods
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