EX6110 not accept password

This device worked fine but then I needed a new router. When I got a new router (same model as before) it decided it didn't want to accept the new password. This means that I can't connect to the internet through the device and thus can't set up or troubleshoot the device. I've tried a factory reset several times and have even moved it to being right next to the hub but these haven't worked. It doesn't have an ethernet port so I can't do it that way either.
I have spent hours going through the website, other websites and even this website and although lots of people have this issue, there never seems to be a reported solution for when this happens.