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Firmware Update Center

On the following pages, you can find the download links for the latest firmware releases of our products.

Desk Phones

Wireless DECT Devices


Latest firmware version C-Series (C520)

Latest firmware version C-Series (C620) - US-only

Public Announcement System

PA1: Neueste Firmware-Version


PA1+: Neueste Firmware-Version

To download older firmware versions please visit our firmware archive.