Reset the router, give me a new IP and tell me what about if I write in the browser's IP with a higher number down? Four or five tries later, voilà! I slip into the router from a complete stranger who could erasing the data connection and force him to watch TV the rest of the night.
This reminds me when the friends of an ISP (whose name I will not reveal), I was told that 60% of email passwords coincide with the user name. In this long ago, of course. I guess things have changed and no longer allow certain excesses.
For now, the router itself that let you configure admin admin rescued, and the evidence I refer.
presto!
Yes, I know, I am a second-rate hacker.