More details here: https://pretendo.network/blog/12-23-23
The gist is that if you factory reset your console you can no longer play online at all. You will receive error code 006-0303 whenever you try to play online. There's no fix, and will probably never be. Wii U is also affected. Pretendo will still work.
This also includes system transfers. I have a 2DS that I turned on after a system transfer months ago, and it receives error code 006-0303 because I did the setup process after this change was made. Not sure if both consoles are affected or just the source console, but I'm not going to test that out.
Edit: NNID doesn't matter. Factory resetting at all after this change means you can't play online anymore.
Pokemon Bank will not work on a factory reset 3DS.
Edit: It's been fixed. https://pretendo.network/blog/12-27-23
[Fixed] PSA: Don't factory reset your 3DS if you want to play online.
[Fixed] PSA: Don't factory reset your 3DS if you want to play online.
Last edited by Elysium on Wed Dec 27, 2023 5:18 am, edited 3 times in total.
Re: PSA: Don't factory reset your 3DS if you want to play online.
Does this affect anything if I were to transfer my New 3DS information to another New 3DS?
Re: PSA: Don't factory reset your 3DS if you want to play online.
My information was incorrect aside from the fact that the source console will no longer be able to go online. I don't know about the target console, and I don't want to test it.
Re: PSA: Don't factory reset your 3DS if you want to play online.
I just did a system transfer between my two old 3DS systems that I don't use much anymore. Looks like the target system is still able to go online after a system transfer! Though, both systems were able to prior to transfer, if that matters.
Re: PSA: Don't factory reset your 3DS if you want to play online.
I think it was fixed today after NN was down this morning.