Thank you for your response :)
There is a possible explanation for the problem you encountered.
Control configuration system works as follows:
1. check if any input device (keyboard or joystick-like) is sending
input
2. if so, assign that input to the currently edited control (steer
left, steer right, etc)
The problem raises when you have an input device that is constantly
triggered, for example the throttle pushed. As soon as you enter the
config panel, the always-triggered control is assigned to steer left,
and the 'success' screen is displayed until you release that control.
You should be able to unlock the system by finding the
always-triggered control in your attached devices, if any.