Set persist.demo.hdmirotation option to portrait, now i can not loggin as admin



My customer asked to have their app on portrait mode. So i activated the "persist.demo.hdmirotation" through mdz file.

Now the touch sensor  is in portrait mode but the screen is still in landscape. With some tests i figured that the back button is somewhere in the top middle of the screen.  The home button is under and so.. But the corner where it is supposed to touch to login as admin is off screen.


I need to revert the setting but i can not access because the corner where usually touch to login as admin is virtually out of the screen.


How i can revert the setting ? and How i can succesfully put the Concierge in Portrait mode?.