EDIT: Problem solved, turns out I needed a newer version of Luma3DS Updater. I'll leave the post here in case it can help someone else.
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I updated Luma3DS to 6.5 with the Luma3DS Updater and now my version appears as a bunch of garbage characters, and the Updater tells me there's a new version available. If I install the latest normal version it
downloads version 6.5.7 and installs it, but the garbage characters remain and the Updater still thinks there's a newer version available.
Everything still works without issue so I'm not sure if it even matters, but it is weird to me that the version string isn't read properly. Do I need to do anything or just ignore it until a new version is available? I can't install the hourly because the github download is missing and it gives a 404 error.
Here's a screenshot of what I'm seeing:
