WN3000RPv2 no longer working properly?

Not sure how i did it, but when I was having a connection issue and refreshed the page I was browsing as a quick check, I was suddenly sent to http://mywifiext.net/ and something about setup and confirming password? I admit I didn't pay much attention; I saw that the password was correct in the field and simply hit continue. Since then, my extender has been struggling. Its speed was abysmal at first, and though it's improved since then, it's still noticeably slower than it should be. It also seems to load pages in tiny, short but noticeable stops and starts. I tried returning to http://mywifiext.net/ to figure out what I'd done, but I only ever get the "Oops!" page and can't do anything to get to...anything. I had thought of updating the firmware, but I can't do that if http://mywifiext.net/ isn't working for me.

I wasn't paying attention and I admit that (like agreeing to Terms & Conditions, am I right?), but it seems that I did something irreversible :( Any help would be appreciated.