Here is a link to a thread discussing the two reboot procedures and a photo of the connector you need to use for the hard reboot.Pop the hood. Right above the passenger side front wheel you'll see a connector. Open up the connector, wait 10 seconds, then plug it back in. Then turn the car on and see if the Agree button is more responsive.
Do not do this with the car on. Make sure the car is off.
After doing this you'll need to re-initialize the parking brake and possibly the windows.
... and it works fine for me. All other buttons get inadvertently activated/deactivated by my sliding iPhone.Note that you need to keep it pressed for several seconds. This is a built-in safety.