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.

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ROM Hack Question Use previously owned game as download key

Thread starter ne0name
Start date Sep 13, 2019
Views 1,109
Replies 5

ne0name

New Member

Newbie

Level 1

Sep 13, 2019

Hello. I have a console with CFW (reinx 2.4 to be exact) and I play a lot of SSB Ultimate (from an nsp). I was wondering if I can somehow use the nsp to install the game on OFW as well. Thank you!

FoxMcloud5655

GBATemp Developer

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Level 7

Sep 13, 2019

How did you purchase SSBU? Is it in cart form, or is it linked to a Nintendo account?

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ne0name

New Member

Newbie

Level 1

Sep 13, 2019

FoxMcloud5655 said:
How did you purchase SSBU? Is it in cart form, or is it linked to a Nintendo account?

I got it as an NSP file installed with Gldleaf

Clydefrosch

Well-Known Member

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Level 15

Sep 13, 2019

no, you can not do cfw things on non cfw switches.

Clydefrosch

Well-Known Member

Member

Level 15

Sep 13, 2019

no, you can not do cfw things on non cfw switches.

FoxMcloud5655

GBATemp Developer

Member

Level 7

Sep 13, 2019

ne0name said:
I got it as an NSP file installed with Gldleaf

That's a copy of an original, then. There's no way you can run that on OFW. You're going to have to go back to where you (hopefully) extracted it from and use the original media. If you've pirated that copy, then there ain't nothing you can do.