The 5A377 firmware is now available for new AirPods Pro owners, up from the 5A374 firmware they ship with.
Apple has not provided information on what's included in refreshed firmware updates for the AirPods, so we don't know what improvements or bug fixes the new firmware brings.
If we learn about any notable changes in the firmware update, we'll share details, but the software likely offers performance improvements and minor bug fixes?