I just did this to my xps 13. The hinge could not open all the way. All I needed to fix it was to open the laptop slightly, wedge a smooth flathead screwdriver between the two metal covers (top/bottom) near where they contact and gently pry against the bent section to unbend it. The metal is VERY soft and did not take much effort. I used my forearm to push against the hinge to support it while I did this and there was no damage to the hinge.