Theoretically it's possible yeah but why would they keep it a secret?
It seems to only perform very basic title managenemt tasks like resuming downloads and installing downloaded content (so only complementing the main OS functionality).
If the system does not perform any sort of software...
It is a myth. People have analyzed the console's boot process and no one's ever found anything like that.
And the only way we could get those nintendo recovery files is if they're leaked somehow.
There is an official method yeah but it requires nintendo-signed files to be placed on the SD card, then you power on the console while holding down certain buttons
It's because they're stupid. plus the projects are always mediocre anyway, I don't think anything of value was lost.
You can just set up a private discord server for your project. No company is gonna threaten to sue some random guy making a fangame only to share with a few people.
You can wait for Aroma to be released. It injects the exploit in the Health and Safety app.
That's because Haxchi exploits a vulnerability in the DS VC games. It injects a modifed rom.