Worked great for me. 2DS 9.2.0U
Had the 0004003000008F02 error while downgrading but the solution offered worked great.
Just a suggestion to make things even easier: consolidate all the sd files in a single archive so it can be a single copy-paste rather than about a dozen downloads and steps.
Probably Kelton. Nothing better to do but troll this place for being banned.
But all of the different downloads may be updated at any time, most of them are on github, so that would be quite some more maintenance on the guides end.