It's always been a product that's very fiddly to set up. Once it's working it's pretty good, but getting there..
I'm not an expert with the iOS version of EZCast, but if you have the D-pad buttons on the app then it indicates that there is a connection between app and A2WII. The firmware we ship with is pretty old, it could be a general problem with later versions of iOS.
The latest version firmware definitely works with all version of iOS so my suggest is to download the PC/Mac version of EZCast app and update A2WII firmware using that. Hopefully it will connect properly and let you update. See here: https://www.iezvu.com/os_download.php?l=en
If it doesn't work then email us for return.