I followed Plailect's guide now twice with the exact same result. I am stuck where it says "29. Launch the Health and Safety Application (which is now FBI) on RedNAND" (part 4, section I). The FBI Inject seems to work, after I reboot into RedNAND/EmuNAND I can see the FBI symbol in the upper screen. But when I click on the "Health and Safety" button i get stuck on the Nintendo 3DS logo.
Up to this point everything went fine. I tried both, the banner and non-banner version. Same result. Since I did the whole guide twice now I really don't know what I am doing wrong.