Firmware updates can be downloaded free of charge from the Internet using the Sennheiser Smart Control app.
Make sure that the batteries are fully charged before updating (see page > Charging the rechargeable batteries using the USB cable).
Take the earbuds out of the charging case before updating and do not reinsert them into the charging case during the update.
Connect your earbuds to your smartphone and start the Smart Control app (see page > Installing the Smart Control app).
The app provides information on available firmware updates and guides you through the installation process.
During the update, the LEDs on the earbuds alternately light up green and purple.
If the sensors for the collection of health data are also updated, the LED on the left earbud alternately lights up red and purple (not with every update).