There is no generic password, that would create a HUGE security hole. If you have held the reset pinhole down for 15 seconds or so with the unit powered on, then released it, the password should be set to what is on the router label. admin will be the user and when you type the password you should see what appears to be other characters when you type..
One person with this issue had to type the password into notepad and copy paste it to get in.
You can change the default setting of 5 bad logins but I DO NOT recommend this credit to armond_in_nj
"You can reset the number of allowed unsuccessful logins. Log on to the device, then click on "Advanced." In the far left column, choose "Users." In "Login Configuration" set the desired number of unsuccessful logins.
Also be sure to either activate, accept, or save all desired changes prior to changing screens or logging off."
Personally I have also added and extra user in case I have an issue with admin