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boot9strap allows code bootROM code execution, but this is not normal behaviour. The NTR path is just another path to boot a FIRM.
=== How does Nintendo reflash bricked systems? ===
=== How does Nintendo reflash bricked systems? ===
'''Theory:''' Before trying to boot from NAND, the bootrom checks to see if a key combination (Start + Select + X) is being held, and whether the shell is closed. If so, it tries to boot from an inserted NTR (Nintendo DS) cartridge.
'''Theory:''' Before trying to boot from NAND, the bootrom checks to see if a key combination (Start + Select + X) is being held, and whether the shell is closed. If so, it tries to boot from an inserted NTR (Nintendo DS) cartridge.
This allows bootrom code execution that is probably used by Nintendo to reflash the system.
This allows to execute a FIRM that is probably used by Nintendo to reflash the system.
== Software ==
== Software ==