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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Hacking Is there a way to check if .xci files are valid?

Thread starter asnka
Start date Jul 11, 2021
Views 1,523
Replies 3

asnka

Well-Known Member

Member

Level 7

Jul 11, 2021

I am setting up a usb hard drive to work with SXOS but I must have a wonky .xci file on there making SXOS freeze when it's loading the games in the album menu.
before I check one by one, is there a program I can use to check them? or some other faster way?
thanks tempers!

masagrator

The patches guy

Developer

Level 22

Jul 11, 2021

NSC Builder has dump validation tool.

thesjaakspoiler

Well-Known Member

Member

Level 8

Jul 12, 2021

the site nswdb has crc values for each game.

raging_chaos

Well-Known Member

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Level 8

Jul 12, 2021

asnka said:
I am setting up a usb hard drive to work with SXOS but I must have a wonky .xci file on there making SXOS freeze when it's loading the games in the album menu.

Not a solution to your problem but do yourself a favor and don't load games from the album menu, large collections take forever to load. Setup Tinfoil, add your USBHDD to it under the File Browser, and load them from within Tinfoil's XCI tab by pressing X.