Auerswald COMfortel WS-500S Notice D'utilisation page 38

Appendix
Press the Device key on the front face to reset the base station to factory
settings. Any existing configuration and user data will then be lost.
1. Press and hold the Device key for at least 10 seconds, until all LEDs go out.
The device is now in programming mode.
2. Press the Device key briefly, until the two LEDs are shining blue.
3. Press and hold the Device key for at least three seconds, but for fewer than
10 seconds.
The device is reset and restarted.
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COMfortel WS-500S/500M - Instructions V02 08/2019