Initial setup of my Roku Express and it is continually doing a software update and restarting. Once it restarts is right back at the first screen for select language. I haven't even been able to set up my account yet.
If you plugged the Roku Express into the TV USB power port, try using the wall adapter and plug directly into wall power outlet. If the device did not come with a power adapter, try using a cell phone charging wall adapter (5volt, 1amp).
My Roku is plugged in to its on power source in the wall. The issue is with trying to set it up for the first time.
There are a couple of things people have reported worked when a setup fails to complete.
Easiest to try, so try this first: Restart your router, even if other devices have no trouble connecting. When your router has completed its startup, try repeating your Roku setup.
More involved: Repeat the setup by connecting to a different wifi network - perhaps via a wifi hotspot on your mobile phone or by taking it to a friend's house - and see if it will complete the startup. If successful, then redo the wifi connection to use your intended home wifi network via Settings > Network > Set up connection.