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

duckstation is an excellent Playstation 1 emulator by Stenzek. It has a very good compabiility and it is quite performant. It also supports all kinds of enhancements such as high resolution rendering and PGXP which can lessen the "wobble" and...

Diagnosing broken wifi with working Bluetooth

Fatfingers

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Jul 11, 2023

Hey all

I’ve been facing a weird issue with a switch lite I have picked up. I’ve heard that the cyw4356x chip can fail quite often but when I test for shorts I only see a few grounds coming out of the chip which very well could correctly be ground? See image below with circles around ground points that I found

I have found one potentially suspicious part that looks like “t374” which I have an arrow and a question mark at could be an issue. Ive found it hard to probe as the top of the smd is ground, however I think (it’s hard to say for sure) the top right foot is not grounded, but I could be just not properly making contact with the pad. I am unable to look this smd up though so I don’t know what should and should not be grounded.

When I attempt to connect to a wifi network I get the following:

However I am able to connect to a Bluetooth joycon which I believe is handled by this chip too, so I’m starting to be suspicious of a wifi related component outside the cyw4356x chip.

Feel free to ask me to probe anything and also please let me know if there are any good resources I can consume to help diagnose the issue independently

still new to hardware repairs and hacking

Cheers!

Edit:
I am also aware of quarts crystals failing in the wifi setup of switches too and it looks like potentially the t374 could be related to this http://www.txccorp.com/download/products/quartz_crystals/2017TXC_8Q-01.pdf

Hardware Diagnosing broken wifi with working Bluetooth

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