Sennheiser Conversation ClearPlus True Wireless ANC Speech Enhancer - Manual (Page 36)

Care and maintenance of the earbuds/charging case
36 | Conversation Clear Plus
Installing firmware updates
Firmware updates can be downloaded free of charge from the Inter-
net using the Sennheiser Conversation Clear app.
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Before updating, you have to insert the earbuds into the charging
case. During the update, you must also not take the earbuds out
of the charging case.
▷
Connect your earbuds to your smartphone and start the Conver-
sation Clear app (> 18).
▷
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 (>
14). Avoid connecting or disconnecting the USB power supply
during the update process.