If you don't have godmode9 already, get it here https://github.com/d0k3/GodMode9/releases/latest

1. Copy GodMode9.firm from the GodMode9 .zip to the /luma/payloads/ folder on your SD card
2. Boot your device while holding (Start) to launch the Luma3DS chainloader menu
3. Launch GodMode9 by pressing (A)
4. Navigate to [1:] SYSNAND CTRNAND -> data -> (32 Character ID) -> sysdata -> 00010038
5. Hold down the (R) trigger, then press (X) on 00000000 to rename this file
6. Press (Up) once to change the name to 10000000
7. Press (A) to save changes
8. Press (A) to unlock SysNAND writing, then input the key combo given
9. Navigate back to the Main Menu
10. Press (Start) to reboot your device

 

If I just want to unlink a nintendo account, will this work for me? I don't need to change region or anything. Is it possible to delete all account info without doing a system format? Maybe system format is what I want though. All my installed games are on the SD.

 

I don't think it is that simple. You can do a system transfer, but I don't know of a way to straigt up remove a nintendo account without reformatting.

 

The friend list of your previous NNID stays there because your created mii is still there you will not get banned if you have your original mii and friends list.

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Actually your friend list does not change at all you would have to remove friends one by one.