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

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ROM Hack Question Darkest dungeon mods

Thread starter imparooo
Start date Jul 7, 2019
Views 3,385
Replies 4

imparooo

Member

Newcomer

Level 1

Jul 7, 2019

Hello
I have SX OS on the Switch and I am an avid player of Darkest Dungeon.Is there a way to port the mods on SX OS?

Thanks. Any help is appreciated.

masagrator

The patches guy

Developer

Level 22

Jul 8, 2019

Maybe try first to search before creating new topic?
https://gbatemp.net/threads/is-it-possible-to-add-mods-to-darkest-dungeon.537557/

imparooo

Member

Newcomer

Level 1

Jul 8, 2019

Thank you and my bad. I was not unpacking the XCI file, so I was getting confused.

Just to confirm I understand the process:

1) Unpack the XCI file (or from the original cartridge)
2) Add the mods in the correct folders
3) Play...?

Thanks

Last edited by imparooo, Jul 8, 2019

Eeveekid

Well-Known Member

Member

Level 4

Jul 9, 2019

imparooo said:
Thank you and my bad. I was not unpacking the XCI file, so I was getting confused.

Just to confirm I understand the process:

1) Unpack the XCI file (or from the original cartridge)
2) Add the mods in the correct folders
3) Play...?

Thanks