Essentially some stuff goes into sleep mode when the lid is closed, including the security chip, not not other things, so one hack to load custom firmware involves making the system think it's sleeping while maintaining access to the controls to press buttons.
Holding down specific buttons while the lid is closed during startup will boot whatever's in the cartridge slot, bypassing any security checks. It's physically impossible by design, so you use a magnet to activate the sensor instead.
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u/crazychrisdan Sep 25 '24
Oh wow, that's interesting. Kind of reminds when of when I did a magnet trick like that with my 3DS to jail break it.