Siemens GIGASET SX762 WLAN DSL Manual page 22

First steps
Reset button
The underside of the Gigaset SX762 WLAN dsl houses the reset button.
Reboot function: Press and hold the right end of the button for more than 1 second but
less than 5 seconds to reboot the device. This does not affect the configuration settings.
Reset function: Press and hold the right end of the button for at least 5 seconds to
return all settings to factory settings.
Warning: This will clear all the configuration settings you have made since the initial
startup.
Updated firmware will not be affected.
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Reset button