Phantom 2 upgrade to V2+ equivalent

As a novice to drones, I purchased a Phantom 2 base model. Had I known that add ons to make it comparable to the V2+ are not plug and play, I would have bought the V2+ instead. With that being said, I attempted to add the ground station, iosd, a gimbal, and FPV. I cannot toggle the gimbal control from the X1on the remote, and I have struggled with my add ons. The Naza assistant says I need a new S/N to use the program. Is the Naza Assistant required for the upgrades, and if so, can I contact DJI or NAZA to obtain a S/N?