Recently, I helped a friend or mine to have his console with CFW using the DSi exploit with my actual console which has already games . Using this, my NNID transferred to the other console and after that I restored the previous NAND on my console. Soon after I noticed that my friend and I were using the same NNID. I heard about that you have to wait a week to transfer back the NNID to my system. I don't know if that means that he's going to lose his save data and mine too. What can I do? I'd really don't want lose any data on my console. Hope you guys can help me.