Hey bud, I had a similar problem to you. Mine would not open. Try lock your car with a key (Takes quite a lot of force to turn the key, don't be shy). If it locks with a key, it is most likely the wiring on the right side of the boot where it goes from the car into the boot. You will have to open it up there and solder the wires back together. It is a very common issue on e90's.