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.

DBI language error

kevinxyz · 2024-04-01T01:04:31+00:00

My dbi language change every time i open it. How to change it to default eng?

ROM Hack Tutorial Updated

How to find the seed (like a password) needed to extract alldata.bin and alldata.psb.m, which contain retro game rom data

sorry for my poor english

Tutorials in Japanese
https://yyoossk.blogspot.com/2023/03/romalldatabinalldatapsbm.html

Download & unzip hactool from the following link
https://github.com/SciresM/hactool/releases

Extract the main file from Section 0 in the Program nca file with NxFileViewer
https://github.com/Myster-Tee/NxFileViewer/releases

https://github.com/Myster-Tee/NxFileViewer/releases

cmd
hactool.exe --uncompressed=main_uncompressed -t nso0 main

If you open the main_uncompressed file in the Hex Workshop Hex Editor, you can see the contents in a composite form.
http://www.bpsoft.com/downloads/

Click on the binocular-like icon at the top

Change Type to Text String, type 【RightAnalogStick】 in Value, and click OK.
or type 【25G/】 in Value, and click OK.
This means to search for RightAnalogStick in the text (characters).
This is because the seed for the other game I referred to was found around the RightAnalogStick text.
Depending on the games that will be released in the future, it may not be in that vicinity.

In the example image, you can see the string 25G/xpvTbsb+6 just above it
This is the seed needed to expand alldata.bin and alldata.psb.m

Extract the alldata.bin and alldata.psb.m files from Section 1 in the Program nca file with NxFileViewer

Download & install .NET Core from the following link
https://dotnet.microsoft.com/download

Download & unzip MArchiveBatchTool from the following link
https://github.com/farmerbb/RED-Project/releases

Copy the two files "alldata.bin" and "alldata.psb.m" into the MArchiveBatchTool folder.

cmd
MArchiveBatchTool.exe fullunpack --keep alldata.psb.m 【zlib】【seed】 64

zlib is a compressed format, and I think it's usually zlib, but it could be different for some games.
For example, for the Mega Drive Mini, it was zstd.

Example
MArchiveBatchTool.exe fullunpack --keep alldata.psb.m zlib 25G/xpvTbsb+6 64

It will be extracted in the alldata.psb.m_extracted folder

Most of them are
alldata.psb.m_extracted/system/roms
folder, which contains the rom files for retro games and sometimes bios files

Last edited by yyoossk, Mar 12, 2023

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