How to boot directly into rxTools when holding L when you turn your 3DS on
Rename boot.3dsx to boot.3dsx.old. Copy rxTools.3dsx to the root of your SD card, rename to boot.3dsx, problem solved.
No idea why I didn't think of that. I assume that's what the forum post I read did, you don't need to download their zip. Or follow their guide. Just do the above instead. It didn't work the first time, but the second time it did. Homebrew is a pain.
What happens if I open hblauncher_loader? I installed the CIA. Will it go in a boot loop? That might be fun, let's try it. It gets a black screen. Was it going to open the homebrew launcher or rxTools? I'll try one more time. Then I'll delete boot.3dsx and rename the .old one back. I might need access to the homebrew launcher. Yup black screen, apparently it can't restart itself.
Is there some other way to get an auto boot thing? Give me a boot menu, that automatically boots if you don't select anything.