I recently had to change the digitizer of my Lumia 920 because of broken glass. On the new panel the back key as well as long press of any key doesn't work. I don't know I damaged already the new digitizer or its just was sub-standard goods at arrival, but I was thinking if it just would be possible to activate the new navigation bar of 8.1 on my Lumia 920. Does anyone know if this is possible. I don't want to order an other digitizer glass