MHV2080BH password removal

[pclab]

Hey

I have this MHV2080BH here that is password protected. I can't remember ever getting one here ti remove the password
I tried to follow PC3K manual on how to connect terminal and remove it, but it does nothing...
Does it take much time or is it immediate?
Thanks

[BGman]

I have unlocked >100 of these by using zu. It takes a minute.