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So normally you can update via the Luma updater, however considering you don't have the Luma logo anywhere on your 3ds I'm not totally sure how you should update. It looks like the latest version of Luma is 10.2.1 fyi. Here's the Luma github page, as it may be possible to update it by downloading and installing the new version of Luma. I'm not totally sure, so I don't want to give you any advice that could mess it up. You'll have to look around on what you should do. I don't imagine that it's necessary to update though, so if you just turn off automatic updates from your settings page, maybe you won't have to deal with this at all.
You can also download the app Luma Updater, install the cia with FBI and update Luma from there: https://github.com/KunoichiZ/lumaupdate/releases/latest