One of the nightlies. I think it was the October one, but I'm not sure. I'm trying to see if I can get the December 5th one to work, but right now it's refusing to boot even though it worked not long ago.
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I got the most recent nightly working again. Miiverse still crashes.
Edit: So Miiverse wasn't actually crashing. During my last attempt to fix it, I left it sitting for a few minutes on the frozen splash screen while I browsed for more solutions and suddenly it loaded up fine about 3 minutes later. Now it loads up fast and fine every time.