Hook it up in this order after clearing out your "open" apps. You can do this by holding down the "home" or button at the bottom and either swipe away the apps or clear all.

Then hook up the hotwire to the esc, your OTG cable , then your phone. If your app doesn't auto open, launch it.

Note that your esc MUST have the latest software installed for the app to recognize the esc. Rx8s and most Gen2's are at 250.