Unable to access admin page after OS reinstall ReadyNAS Duo RND2150 v2

Hi, I recently aquired a ReadyNAS Duo  model RND2150 v2.  I am unable to access the router admin page.  I have RAIDar loaded and am able to access the 500GB drive that I have installed which appears to have been set up automatically by the NAS software as it has two shared folders which I did not create (Backup and Media).   Status is Healthy and Firmware is 4.1.10.  When I click on the admin page from the RAIDar utility it opens a browser window for the designated IP for the device and prompts for credentials.  I've used the default and several other combinations from the common netgear password page.   admin / password   admin / admin  etc.   I've performed a OS reinstall and a factory reset using the reset pin and instructions yet the page continues to appear like it doesn't accept the login credentials.  Any ideas I can try?  Thanks