Since my car was broken into and my RNS version B was stolen I have purchased a Ver H to replace it, is there anything I need to do before I put it in or is it a straight swap? I never had any battery drain issues with the Ver B but it had an early version of FW on and when I went to 2760 I installed the modified version just incase. The H is running standard 4120 so I'm slightly concerned about the possibility of battery drain. My car is a early MY07 so could just be on the verge of the canbus upgrade.