Can not get ADMIN access on Polycon VVX601 ?

Have a couple Polycon VVX601 phones that I was able to login and reset the password. But not allowing me to login as as ADMIN. Goto Settings / Advanced, and only see Change User Password, and Reboot Phone; I don't see any admin features. Same with the Web Browser interface. I just de-provisioned the phones with RingCentral, is there some Ring Central password used to get to the Admin console on these phones?