Hello guys, this is my first post here! I just got a MIG Switch card out of curiosity and I was tinkering with it. For those who don't know, it's used by placing XCI dumps as well as other game specific bin files in the sd card of the MIG Switch, and are obtained from the original cartridge by using an app like nxdumptool. Two of these bin files are mandatory to get the game to boot: Initial Data.bin and Certificate.bin. They stay the same for every cartridge of a specific game. Now, if you want to use an XCI dump from a shady website it's impossible to get it to work without those files. By using the Certificate.bin from another game it has no problem, but this does not count for the Initial Data.bin. So I looked for a way to obtain this Initial Data from an XCI file and read a bit of the XCI file documentation from switchbrew dot org. Here's what I understood so far: The Switch checks if the cartridge is valid by doing a challenge–response authentication on the Initial Data. The Package ID is contained both on the XCI and the Initial Data, on positions 0x110 and 0x0 respectively. The Initial Data hash is on the XCI at position 0x160. It is calculated by doing a SHA-256 hash on the full Initial Data content. So I was wondering, is there a way to to construct a functional Initial Data file starting from an XCI dump? I also tried a reverse approach by editing the Package ID in the Initial Data from another game, generating the Initial Data hash and putting it in the XCI file but is not enough to get the Switch believe it's a real game. Sorry if this may seem stupid but let me know what you think.

duckstation for Switch

catlover007 · 2024-04-22T04:06:40+00:00

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ROM Hack Question Anyone working or planning on making codes for Dragon Quest XI?

Thread starter Mandikiri
Start date Aug 26, 2019
Views 2,198
Replies 2

Mandikiri

Princess

Member

Level 9

Aug 26, 2019

Just wondering if anyone is planning on making codes for the game. Granted, the game has yet to come out.

Falo

Well-Known Member

Member

Level 11

Aug 26, 2019

Just dropping these here:
https://gbatemp.net/threads/cheat-codes-ams-and-sx-os-add-and-request.520293/page-478#post-8767245
https://gbatemp.net/threads/cheat-codes-ams-and-sx-os-add-and-request.520293/page-480#post-8768416

Will be easy to update them for the full version, thanks to the Unreal Engine script function names in the executable.

Mandikiri

Princess

Member

Level 9

Aug 26, 2019

Falo said:
Just dropping these here:
https://gbatemp.net/threads/cheat-codes-ams-and-sx-os-add-and-request.520293/page-478#post-8767245
https://gbatemp.net/threads/cheat-codes-ams-and-sx-os-add-and-request.520293/page-480#post-8768416

Will be easy to update them for the full version, thanks to the Unreal Engine script function names in the executable.

Thank you for this. Will keep an eye for the full game.