Yeah, looks devkitPro related. I'm still using r45 on my laptop, so I guess I'll blame r46 for this. Seems easy enough to resolve, anyways.
I have no idea. 2.x isn't exactly the most stable firmware. Most of the pre-rewrite firmware versions are physically incompatible with post-rewrite applications. It's not like one would want to run 2.x for a very long time, so if anything I'd say that's more a PoC than anything.
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Yeah, please use the hourly from jenkins:
https://j.chaos.moe/
The stable release is old now. Ancient, even, and there are a few known issues in it. I keep telling myself to make a new stable release and not doing it. :/