NOTE : Requires A9LH. We do not know if this works on redNAND/emuNAND, try at your own risks! You have been warned! The ban is transfered to the target system, but unbanning steps (does not inclde the abillity to relink/create an NNID) are included in the guide! So if you try this, PLEASE try it only on a 3DS you own, and are willing to "throw" online functionnality of away, like a used one, or something, NOT a friend's or family's 3DS, as the linking/creating of an NNID WILL NOT WORK ANYMORE. You will loose saves, games, Friend Code, StreetPass Data, etc. on the source console. This only works if you transfer a banned system to another (the target can be banned, or not, it does not matter), the opposite DOES NOT work! Credits go the @Majickhat55 for the method, and to @ForeverEternal for some parts of the guide. I only wrote the guide based on @Majickhat55 's experience. Quick Note : Transfers only work in the following ways : - Old 3DS to Old 3DS (includes 2DS) - New 3DS to New 3DS - Old 3DS (includes 2DS) to New 3DS - New to Old DOES not work! Relinking your NNID to another console should not work, and even if it does, it's not recommended to do so. Please create a new one for safety measures, or don't use any. --- Alright, so on to the tutorial! First of all, follow this tutorial to unban the banned 3DS : https://gbatemp.net/threads/tutorial-how-to-unban-your-nintendo-3ds.449251/ <-- Read the post in its ENTIRETY before attempting it! Once you are done : 1. Make a NAND backup of BOTH systems, as well as save backups of the source 3DS; the target will be fine as long as you restore a NAND backup. 2. OPen Decrypt9 on the unbanned system, and go to SysNAND Options > System File Dump... > LocalFriendSeedCode_B. Store that somehwere, you will need it! 3. Backup both SD cards to your PC. Give names to the folders to differentiate both 3DS's! 4. Perform a System Transfer from the banned system to the other system. It will throw an error if you do not apply the unban method! 5. Once the transfer is done, you may restore the target 3DS's NAND backup, as well as SD contents from your PC if necessary. 6. Your source 3DS, which was banned, should now be fully unbanned, with the abillity to link a new NNID. All saves, NNID, and FC will be gone, though. Your target 3DS is now banned. 7. Download this blank nnidsave.bin : https://cdn.discordapp.com/attachments/202581739959353344/249934940639068170/nnidsave.bin 8. On the now banned system, open Decrypt9, go to SysNAND Options > System File Dump... > SecureInfo_A. 9. Open SecureInfo_A in a hex editor. The very last line should be your 3ds console's serial ID. To confirm this, it should match up to the code on the back of your 3DS (it will be located under the top cover plate on a New 3DS!). Without changing the first 2 letters, just change some random numbers and make a new serial ID. 10. After that, put the new SecureInfo_A, the unbanned LocalFriendCodeSeed_B (backed up from before the transfer) and the nnidsave.bin in the files9 folder of the banned 3ds. 11. Open Decrypt9 on the banned 3DS and go to SysNAND Options > System File Inject... > SecureInfo_A and then do the same with LocalFirendCodeSeed_B. Press B > System Save Inject.. > nnidsave.bin. The banned system should now be unbaned, though you will not be able to link or create an NNID on it. 12. Profit! This method has not been tested by a lot of people. Please give feedback!