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Nintendo 3DS: Development Flashcard compatibility #267

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flipacholas opened this issue Mar 16, 2024 · 0 comments

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flipacholas commented Mar 16, 2024

By Myriachan (https://twitter.com/Myriachan/status/1768690901717856342)

A minor thing I noticed =)
“These flashcards still only run on non-retail equipment”
True for ordinary developers, but Nintendo could, and did, use these same flash carts on retail systems.
With the keys dumped, you can do the same with retail games if you know how.

Specifically, take the cartridge dump of a retail game, use ctrtool to decrypt the cartridge title key, then put the decrypted title key into bytes 0x1400-0x140F and flash it to the cartridge.
If the save chip in the dev cart is compatible, this will boot on unmodded retail 3DS.

Or maybe it was 0x1200-0x120F. Like the DS and DSi, these are write-only portions of the flash carts.

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