lost the CPE?

Seraching in the topics in the forum
If I read well, when the admin password of a CPE Client is lost…
Isn´t there a physical procedure that permit restore to factory default for begin the configuration from zero?
Thanks in advance…

reinstall is the only way to reset the password

Thanks Normis,
Form your answer I find other topic with the link http://www.mikrotik.com/docs/ros/2.9/guide/netinstall

I´m reading the information.
Thanks in advance.