ROM Hack Missing "ExtractedExeFS" in my .cia

Reshiban · Nov 12, 2019

Steps for making a code.bin if he is missing by extracting your own .cia -> to making code.elf for IDA Pro
Use update files and not the complete game if available.

1) Open GM9 -> [A:] for SYSNAND SD -> go in path of your app
2) Press A on .tmd file -> "TMD file options..." -> "Dump CXI/NDS file"
3) Press A on .tmd file -> "TMD file options..." -> "Extract .code"
4) Use this tool to extract your .cxi, and get "./DecryptedExHeader.bin"
5) Copy "<tid>.dec.code" in the same path
6) Rename "<tid>.dec.code" in -> "code.bin"
7) Download and execute this python script in the same path .
8) Get -> codecave.elf

Thanks to: @Ammako and @Ryccardo for their help!
Creators for all programs and scripts used, and @Zetta_D for found these

-------------------------------------------

Original:
Hello, I need help pls!

For explaining fast, I want to get code.elf of a 3ds game for open with IDA Pro.
So I use this tool for extract my .cia, and get "/ExHeader.bin" and "/ExtractedExeFS/code.bin"
The last step is executing this script python and I get -> code.elf .

We must do this methode on the update files for code.elf match with your game PkmnORAS 1.4.
So I launched GM9 and generated .cia file from update tmd file.
I use the tool for extract .cia, and... I found only "/ExHeader.bin" and the "/ExtractedExeFS/code.bin" is missing!
So when I get update.cia from internet, this file (and folder) are created, but with my updategm9.cia, the file (and folder) are missing! ;-;
I can get my updates from internet, but I prefere extract my owns updates.

So, do you know a solution/alternative and for what this appens please?

Thanks!

PS: 2 screenshots of my contents ar linked

Ryccardo · Nov 12, 2019

Well, since you already managed to get the exefs as a file... get a(n updated) copy of 3dstool and use the following command, of course in a command line so that you can see any errors:

3dstool -xvtf exefs DecryptedExeFS.bin --header exefs-header.bin --exefs-dir exefs

Reshiban · Nov 12, 2019

Ryccardo said:
[...]3dstool -xvtf exefs DecryptedExeFS.bin --header exefs-header.bin --exefs-dir exefs

I got this:

Code:

ERROR: the file type is mismatch

That seem an error by 3dstool and not by cmd

Deleted-236924 · Nov 12, 2019

You can mount CIA or NCCH in GM9 to extract files you need, much simpler that way.

Ryccardo · Nov 12, 2019

Yeah, it doesn't like that file...

...well, if you have it currently installed on your console, no need to go through a cia - you can use GM9's "mount ncch" feature to directly copy and paste the extracted parts (or you can use fuse-3ds to access the encrypted installed title on SD using a computer!)

Reshiban · Nov 12, 2019

Ammako said:
You can mount CIA or NCCH in GM9 to extract files you need, much simpler that way.

Ryccardo said:
Yeah, it doesn't like that file...

...well, if you have it currently installed on your console, no need to go through a cia - you can use GM9's "mount ncch" feature to directly copy and paste the extracted parts (or you can use fuse-3ds to access the encrypted installed title on SD using a computer!)

No, mounting .cia with GM9 will mount the encrypted content (the "/exefs/code.bin" is "/exefs/.code" in GM9 by example)

BUT I've mounted the .cia with ninfs and that work! The "/exefs/code.bin" is accessible! Thank you!

Edit: Finaly that don't work still seraching

Deleted-236924 · Nov 12, 2019

ReshibanGaming said:
No, mounting .cia with GM9 will mount the encrypted content (the "/exefs/code.bin" is "/exefs/.code" in GM9 by example)

That's not how this works.

Reshiban · Nov 12, 2019

Ammako said:
That's not how this works.

Ah yes sorry I don't realy know how this work, that I wanted to said it is I've already tryed and that havn't worked.

And at the final there is a problem, I have put the files correctly etc... but the code.elf isn't good xD

So I will retry your GM9 option

Deleted-236924 · Nov 13, 2019

When you're creating a CIA from your installed update, are you picking (standard) or (legit)? And is it a genuine update from eShop, or one you've downloaded online in the past?

Reshiban · Nov 13, 2019

Ammako said:
When you're creating a CIA from your installed update, are you picking (standard) or (legit)? And is it a genuine update from eShop, or one you've downloaded online in the past?

She was downloaded from the eShop, and I built CIA in standard

Deleted-236924 · Nov 13, 2019

Okay, I think the problem here is not encryption, but compression (there is no such thing as an encrypted .code, but it can be compressed.)

In GM9, navigate to the folder for your update, but instead of pressing A on the .tmd, press A on the .app

Then in NCCH options, go all the way to the bottom, and do "Extract .code", this both extracts + decompresses .code

Otherwise you can mount the CIA, and you can do NCCH options --> Extract .code from the .app inside.

Reshiban · Nov 13, 2019

Ammako said:
Okay, I think the problem here is not encryption, but compression (there is no such thing as an encrypted .code, but it can be compressed.)

In GM9, navigate to the folder for your update, but instead of pressing A on the .tmd, press A on the .app

Then in NCCH options, go all the way to the bottom, and do "Extract .code", this both extracts + decompresses .code

Otherwise you can mount the CIA, and you can do NCCH options --> Extract .code from the .app inside.

Re,I did your operations. An name.code file has been maked for the .app and .tmd (with the same size for both), file what I renamed to code.bin for the python operation.

I've taked the ExHeader.bin and code.bin and executed the .py... and the .elf is realy workin! Thank you!!!

I put screens and edit the first post ;-)

Reshiban · Nov 13, 2019

Strangely, the methode has worked for 1 game I've tested, and after this post, I've tryed with other games... but now... she don't work ;-;

BUT! I've found an alternative, so I put here the old tutorial I've maked, and put the new methode in the first post (it's with .cxi

)

-----------------------------------!!!Don't work!!!--------------------------------------

Steps for do what I've tryed (making a code.bin to making code.elf for IDA Pro)
Use for updates and not the game if there is that

1) Go in GM9 -> [A:] for SYSNAND SD -> go in path of your app -> Press A on .tmd file -> "TMD file options..." -> "Build CIA (standard)" and return for "Extract .code"
2) Use this tool for extract your .cia, and get "/ExHeader.bin"
3) Move the "name.code" file in same folder of extracted content -> rename to "code.bin"
4) Execute this python script and get -> code.elf .
5) Enjoy!

Thanks to: @Ammako and @Ryccardo for their help!

Nick3421421 · Dec 26, 2019

hey should i use a decompressed code.bin

Nick3421421 · Dec 26, 2019

can someone give me the .elf for this

Reshiban · Dec 27, 2019

Nick3421421 said:
can someone give me the .elf for this

Yep but go in pm discord and delete your content, GBATemp don't allow sharing content owned by Nintendo or other licence, I go to sleep, I can tomorrow

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