So I found this thread on reddit by uberSchafi. He basically proposes a method that could theoretically allow for: Use your 3DS to system transfer without losing your NNID Multiple DSiWarehax downgrades from a single console without waiting 7 days Use a 3DS from any region to transfer to a any other region 3DS (May not work on source N3DS) The proposed method is (all steps but 5 refer to source A9LH'ed 3DS): Make a NAND Backup Modify your "SecureInfo_A" serial (and possibly region) and restore "nnidsave.bin" to it's default state (as in the state of a console without a linked NNID) Format 3DS and register a new NNID, (since theoretically you are using a different serial, it should not unlink the original NNID) Enter eShop, buy DSiWare, inject save System transfer to another 3DS On source 3DS restore the original NAND backup (this should restore your serial along with your NNID) Possibly repeat the steps with a new serial without waiting 7 days I think this should work (at least when not changing region) since it's basically adding the System Transfer and restore to the "Unban NNID" method such as this. It would be great if anyone that has "unbanned his 3DS" could confirm if they could System Transfer. Changing 3DS region could complicate or limit the process, since if done improperly you lose eShop access on O3DS and there's no access for N3DS whatsoever. Since you are not using your serial or "nnidsave.bin" when system transferring, theoretically you are transferring from another console, not yours so restoring your original backup should restore your original NNID IF "SecureInfo_A" serial is the only information Nintendo uses to identify your console. Of course this is all theoretical as we haven't proved anything yet, I would like us to discuss, correct and prove wether it works or not. Unfortunately I don't have two 3DS's to test, I am interested in this method to Downgrade a friend's 3DS who adamantly refuses to hardmod it while still preserving my NNID. Since he refuses the hardmod so much, I am not sure I can convince him to let me attempt this experimental method, but I'll try. I would appreciate any thoughts on the matter or brave people willing to test. Thanks.