Hi there, I modded my first wii back in early 2010 febuary, and I installed it on a 3.3 menu system. I havent ever upgraded it (the system menu), every games work perfectly. Im doing another mod now for a friend, and I want to be as safe as possible. Going from experience, I remember backing up my nand and the process of it. I also remember there was a write option to system nand. So Im thinking wouldnt a duplicate copy be better. (Copy my NAND as of today, write it to the other system directly to NAND) The other system has homebrew installed and a different system menu. When I modded my orginal wii, it was trail and error, lots of experience and learning the system. It was sitting behind TV doing nothing and then I found out you could mod them and I had nothing to lose but try. I was hooked. Thanks again Blackacidevil PS... What is the real difference between system menu being upgraded, like i said mine is 3.3 and every game works, all new ones, call of duty black, rockbands, donkey, etc.