Hi consci,
I'm sorry to hear you're unable to connect your camera after you updated the Canon Camera Connect app. There is not a way to roll back to the previous version of the app. One thing to try would be to clear the wifi settings on the camera and try setting up a fresh connection. If the wifi settings on the camera haven't been cleared yet it could still be trying to connect to the old version of the app.
To clear the wifi settings go to the fourth page under the yellow wrench icon, select Communication Settings, choose Built-in Wireless Settings, and select Clear Settings. Once you've done that go back into Built-in Wireless Settings and enable the wifi. When you do that the camera will have you set a nickname. Make sure to add or change some characters so that the nickname is different from what it was previously. Once you've done that try reconnecting the camera and smartphone.
