Can you try with an airmouse?
Are you using a standard USB PC keyboard and tried a different USB Port?
First try the method to connect with your phone or PC then it will ask for the wifi password again.
Also check if you can connect an ethernet cable to get a connection and go past the setup without wifi.
Please post screenshots of the wifi screen, onscreen keyboard if you still have problems.
I got through the Keyboard issue by changing the default to AOSP (Android Keyboard). But then the new problem is HDMI Audio Output, Can’t hear anything on my TV (Sony Bravia).
This seems to be a bug.