Rebooting a phone without unplugging?

Most Yealink phones support a long-press on the X button to trigger a prompt for a reboot. Pressing OK then causes the phone to reboot.

But some phones do not have an X button (like the CP860 and the cordless phones to name a couple...).

A W56H can be reset it's W60 base
Setting -> System Settings -> Base Restart
The phone prompts for the PIN
Then the phone base restarts.

** What if the user doesn't have the PIN?
** Does this work for the W56P base?
** Does this work for the W52P base?
** And is the menu the same?

A user can factory a desk phone (or a CP860) with a long press on OK...

But with a cordless, the phone prompts for a pin (which does make SOME sense - to avoid one user rebooting or resetting the phones).

Is there an index or reference to these methods?

Thanks in advance!!

Mitch