Linksys Wireless Router :: Can't Change Admin Password On WRV210

I just got a WRV 210 wireless router (three of them actually, planning to set up a VPN). But I can't set the admin password. I've tried 4 times, and every time, i've got to hold the reset button to reset to factory settings in order to access the management pages! I enter the new password in both fields, and then click to save the settings. It restarts. Then i try to log in - and it doesn't accept the new password. It doesn't accept the default password. I've tried with admin/(new password) and (new password)/(new password), and admin/admin. None of them work, forcing me to reset router to factory settings. I've tried a password composed of 6 letters followed by a . Thinking that maybe the . was throwing it off, I tried 6 letters followed by 3 numbers. That doesn't work either. I've updated to firmware version 2.0.1.5. No luck.