Do you have a9lh and Luma? If so you can update. Update Luma to 6.6 if not on it already. You'll probably need to download the latest homebrew launcher cia (can get it from TitleDB in FBI) and have internet enabled when you launch it after updating, because it will download a new payload. And if on N3DS then turn off clock settings in Luma config.
If you don't have a9lh and Luma, get it now, because 11.3 blocks all CFW installation.
Https://3ds.guide/get-started
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I don't know a lot about it but what you're after is NTR.