NR7101 - No access to GUI after upgrade from ISP custom software to standard software


Got password for the NR7101 based on serial number and was able to log in to the device through serial console as root and supervisor.
Upgraded the firmware from the ISP-customized firmware to Zyxels standard software. Now running ABUV.11. Used multicast method for this.
But how do I get access to the web gui? Not able to use the root/supervisor-user and the admin/1234 is not working. Is the admin-password something that is generated differently from the others and needs to be used for the web gui?
From the serial console, I also tried changing the admin-password. That did not help. IS the admin used for gui access not a system user?
NR7101 had the ABUV.4 software and S200 serial indicating it is a few years old. Understand that there maybe was some changes along the way in regards of how the passwords are set up?
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