Firmware updates can be downloaded free of charge from the Internet using the Sennheiser Smart Control app.
▷Before updating, the earbuds must be removed from the charging case and must not be placed back into the charging case during the update.
▷Connect your earbuds to your smartphone and start the Smart Control app (> Installing the Smart Control app).
▷The app provides information on available firmware updates and guides you through the installation process.
▷Make sure that the batteries are fully charged before updating (> Charging the rechargeable batteries using the USB cable). Avoid connecting or disconnecting the USB power supply during the update process.