R6260

I have an R6260 and today I received a message to update my Router. I took my Adroid, clicked on the nighthawk app. It didn't like my password. So you said you'd send me a verification cold and a chance to change my passwod. I entered the verification code exactly and had it verified and entered by new password. I got a message saying the verification number was wrong. I verified it and had it checked and I had extered EXACTLY what I was sent so i did it again and it then said my new password was incorrect. I did it all again. IT DID NOT TELL ME I HAD used that password previously. I said screw it and I went on line with my PC and got to Netfear.com. That didn't like the password I entered so I changed it and it worked. So I went back to Nighthawk and it doesn't like my password again. I have tried 11 times to sign it. It doesn't like verification coeds, it dowesn't like passwords, it doesn't lile sms codes. This is nuts!