Hey guys! So, I bought a Supercard DSTwo not knowing how much I'd have to do to get it running. I figured out I had to downgrade my firmware of my (old) 3DS, which was on version 18.104.22.168E. For this, I used the following videotutorial: This went very well, but there's one bad thing: In the video he mentions the case, that the Nintendo 3DS won't boot up anymore. He suggests to take out SD card, boot the Nintendo 3DS then and put in the SD card afterwards. Well, this worked, even though I had to it everytime now when booting my 3DS. In the video he talks about once. So yeah, I then proceeded with this guide: https://3ds.guide/installing-arm9loaderhax And that's where the struggle got real. First of all: I created a shit ton of backups, everytime I was supposed to and even more. The first section asks me to back up serialnumber>_nand.bin, if it exists. Well, it didn't, so nothing to back up. So yeah, I worked through that guide and got to section 3, configuring Luma3DS. The last step this section says: "If you get a black screen, just continue to the next section" Great! That's still the case for me! So I skipped section IV and proceeded with section V, "Injecting FBI". I finished that section and the next section asks me to launch the "Health & safety app". Well, fuck me! What happens now is: My Nintendo 3DS will just print a black screen when booting with SD card. When I remove the SD card and try to launch it, the blue-light turns on for a second and then immediately shuts off again. With SD it still boots, but remains in the black-screen. So, what to do now? Did I brick my system? If you're telling me "restore with your NAND", please explain what you mean. I backed so many things, but I have no clue what "the NAND" is? Is it the otp.bin file? Is it the serialnumber>_nand.bin that didn't exist on my system anyway? Sorry, if those are dumb questions - I just really don't get all this shit and spent so much time to even find those guides. Thanks in advance!