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The reset button has the following functions:
Hold this button during boot time until LED light starts flashing, release the button to reset RouterOS
configuration (total 5 seconds).
Keep holding for 5 more seconds, LED turns solid, release now to turn on CAP mode. The device will now
look for a CAPsMAN server (total 10 seconds).
Or Keep holding the button for 5 more seconds until until LED turns off, then release it to make the
RouterBOARD look for Netinstall servers (total 15 seconds).