Thanks! Unfortunately I can't check the software version with blank screens, right? Are they still fiddling with your lane keep assist problem? Like I said before, they replaced the camera in my case for the lane keep assist problem. In your case it's sensor?
-Ben
Probably if you look closely your infotainment screen in the middle console lights up a bit greyish now, is that correct? (Backlight still on).
Go to the back of the car, open the trunk and on the right you can take a part of the side out, to find a fusebox. All the way in the back there is a huge grey cable, unplug this with the car turned off.
Put it back in and notice that your screen has gone black now (instead of gray, the backlight is off). It will stay black when you turn on the car, the radio might start playing.
If you try to start the car you get some unimportant warning, you can ignore this.
Please make sure the car is charged to >80% SoC, start it with the button and keep it in "P".
Press and hold the button on the left of the upper part in the 'roof console' (right one is SoS, left one is to connect with the Remote app and also force updates). Press and hold this left button for more than ten seconds, it blinks slowly now. With a little luck your screens will come back now.
If this doesn't work then make sure you leave the car parked overnight with good reception and >80% charge and repeat the button pressing on the inside of the roof when in "P" the next morning.