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Apple Quietly Updates AirPods Firmware to Version 3.5.1
Apple today quietly put out a firmware update for the AirPods, bumping the Bluetooth headphones from version 3.3.1 to 3.5.1, as spotted by a user on Reddit. The update to AirPods is automatic for any AirPods in their Charging Case and connected to a nearby iOS device. After making sure the AirPods are connected, users can check their current firmware version by going to the Settings app on iPhone > General > About > AirPods.
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