You can use the Bang & Olufsen app to update the software of your Beoplay A6.
The app is available for download from the App Store and Google Play Store.
Go to Product settings - Software to see if new software is available. In such case, the text 'NEW SOFTWARE AVAILABLE' is shown. Here you can also enable the setting 'Automatic software update' to ensure that your Beoplay A6 is always updated to the latest software version.
