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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Hacking Question Cant decrypt Mario Tennis Aces XCI

Thread starter cdhoff
Start date Jun 30, 2018
Views 3,049
Replies 6

cdhoff

Well-Known Member

Newcomer

Level 3

Jun 30, 2018

I have tried using multiple different methods, but I can not decrypt my backup of Mario Tennis Aces.

SOLVED: Card2 games don't work with those tools.

Last edited by cdhoff, Jun 30, 2018

GraFfiX420

Well-Known Member

Member

Level 9

Jun 30, 2018

What methods are you trying?

jakkal

Well-Known Member

Member

Level 14

Jun 30, 2018

You don't have the right keys

datahoarder

Organized.

Member

Level 6

Jun 30, 2018

The most vague post ever. You're going to have to elaborate.
https://gbatemp.net/threads/decrypt...ackup-loading-ryujinx-yuzu-in-1-click.506954/

cdhoff

Well-Known Member

Newcomer

Level 3

Jun 30, 2018

GraFfiX420 said:
What methods are you trying?

https://gbatemp.net/threads/how-to-use-layeredfs-for-backup-loading-what-games-work-dont.507510/

https://gbatemp.net/threads/decrypt...ackup-loading-ryujinx-yuzu-in-1-click.506954/

GraFfiX420

Well-Known Member

Member

Level 9

Jun 30, 2018

Use hactool and a proper set of keys

cdhoff

Well-Known Member

Newcomer

Level 3

Jun 30, 2018

http://imgur.com/ghLPo0Ml.png

This is the error I receive with the "One-Click tool"

Edit: I tried another game's encrypted ROM and it worked.

--------------------- MERGED ---------------------------

Okay, I think I figured it out. Its a card 2 game, which seems to need different methods