Hey!
So, I just tried to install BAX (BootAnimX/10) to my o3DS.
Switching the boot.firm's in the new folder etc. works just fine.
After converting the MP4 file of the animation to IVF and trying to run makebax-win64.exe "input.ivf" "startup.bax" I got this error message:
makebax v0.1a...