Thanks to GBATemp User I pwned U! for this method. His original tutorial is here. We've discovered the fastest way to get around Nintendo Network ID Bans without formatting or deleting old NNIDs! A video tutorial by @DarkFlare69 is here. It features everything listed in this tutorial! Note that this won't work for the 022-2812 or 002-0102 bans given to Sun/Moon players who used online functionality before release. However, you can use this tutorial to switch your LocalFriendCodeSeed with another legit one to unban online services. You will need arm9loaderhax or an EmuNAND to do this. If you're scared about losing games and certain data tied to your NNID, take the precautions here before you start. Launch Decrypt9. Extract your SecureInfo_A from your emunand. Shut down your 3DS. Download an empty NNIDInfo.bin file here. Put it on the root of your SD Card. Open the SecureInfo_A in a hex editor and edit the serial number of your console. It will be in the 'Text' section, not the 'Hex' one. CTRXplorer will also work for this. Put the SD card back into your 3DS. Inject the modified nnidsave.bin and modified SecureInfo_A into your emuNAND. (I'd highly recommend you backup your NNIDSave first if you want to use the eShop later.) Boot emuNAND and create a new NNID. Have fun! If you get a black screen after doing the second method, your CFW doesn't support unsigned SecureInfo_A files! This usually happens on Gateway. To fix this, either inject the original SecureInfo_A file from your SysNAND or use Luma3DS with it. Once you've done this, you can mess around with Miiverse Custom Image Tool or play whatever online games you want. This method changes your 3DS's ID so you don't have to worry about anything that you were banned from before, so even things not reliant on NNIDs will still work with it. Good luck! Note that when making new NNIDs, email confirmation is not enforced, and you don't have to worry about it if you don't want to. The quickest email accepted by NNID Settings is email@example.com. For some information on the nnidsave.bin file, look here. For a lot of information on the SecureInfo_A file, look here.