Make sure that you unlock your device before trying anything.
You don't simply install a nbh file to the phone. You need the RUU that is designed for this particular device. Once you have that, put the nbh file in the same folder as the RUU and run the RUU (follow the steps). There should be a guide for upgrading this device floating around here somewhere, you should look for it and follow it to avoid damaging your device.
Good luck!