If you updated using the "all" file, your old password should be still active.
Username: admin
this is always correct.
if you updated with the "rst" file, the router is reset to default settings, then, the password is reset, then try "password" as the password
Being unable to login to the webinterface can also result because of security settings of your browser:
try a vanilla internet-explorer, with standard settings. Disable all Internet-filtering software, and, check that scripting is allowed.
to check if this is the problem, try a login using telnet. If the login with telnet works, but, not using the web-interface, there is a problem with your browser settings.
