One more thing, unless you seize rear wheels with fully parking brake on downward incline(don't pull up side barke to somehow degrees, pull it up as fully as you can), the smart car will be rolled downward in distance a half of wheel, and the gear must be tied up to parking position. Next, the car can't be gear-shifted to Drive position.
In my case, in order to repair stuck transmission, the mechanic reprogrammed the engine operation software to the recent version according to that he stated it was recently upgraded.
Be careful on parking at the hill. In reference, the operating software of the engine seems recently upgraded.