You need to sit down and let the adults talk, son. I know what it is, how it works, and how to flash it. I already have an AK2I with ntrboot. Thing is, that I roll my own and mine boots whatever is named sd:/ntrboot.firm. I do this so all I have to do to assist someone is to copy and paste a folder I have put together onto their SD card, pop in my ak2i, which will boot safeb9sinstaller (named ntrboot.firm) which in turn will boot boot.firm (luma) after the install is done. I homebrew a system in 2 minutes flat, with FBI, freeshop, latest commit of ftpd, and an SNES emulator, among other things.
I had a day 1 O3ds. I had a GW before Homebrew existed. I've played around with most CFWs out there (and the source code as well). Don't think I need to read much about CFW unless a new one comes out.
What I was asking is how the SG team set up their card since they posted ZERO instructions on the ntr function, and they provided no tool or source (for inclusion in flashcart_core) to be able to flash your own ntrboot header. Indirectly, I already received my answer from
@json, so there's no need for you to make an attempt at being smart. You're not.