User talk:3dsguy

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Thanks,3dsguy. How did you get it? Matyapiro31

As much as I'd like to say, I can't tell you where i got it. But i'm trying to post info as much about Dev 3DS as possible

Does your development 3DS appear to be same hardware as ordinary one? --Matyapiro31 16:10, 18 October 2011 (CEST)

Yes, Matyapiro31, it seems to be that way, i was surprised when i got it, that it did not have parts of the case in red like a panda dev unit, but it had the sticker on the back saying it was a "Development Unit". Also the FCC id does not differ between my Development Unit and a Retail Unit. This probably explains why in the Config menu, the "System Mode" (which I believe is memory allowance) is stuck on "Prod". For some reason Prod mode is 64mb. Why do you ask?


Hi 3dsguy, maybe you have something like a kiosk "demo unit" used at stores (like GameStop, etc.).

  • Do you have a retail 3DS unit? I'm curious if your test unit will communicate with a retail 3DS unit. ( downloadplay, street-pass, etc. )
  • Does it connect to (production) nusd update servers for any updates?
  • Do you have any other software or hardware with it? ( firmware updates? rewritable CTR cards? etc. )
  • Can you get more of them however/wherever you received yours from?
  • Would you be willing to run pre-compiled apps imported through your dev menu on your test unit? [and if so do you have an email to send them to]
  • Would you be willing to lend or rent your unit out? I'm pretty sure you won't but it wouldn't hurt to ask.

- Jl12


No problem, I don't have a dev unit or anything so at least I can help out a little this way, lol. Nathan 17:19, 20 May 2012 (CEST)


3DS Development System Talk[edit]

Quick link to a page on .CIA files, with sample .cia!!

I do not know a way of creating .CIA files. its just that Jl12 asked me as part of a set of questions on my talk page:

  • "Would you be willing to run pre-compiled apps imported through your dev menu on your test unit? [and if so do you have an email to send them to]"

I said of course, and gave some details. Then, Jl12 responded to that emailing me 3 apps to test. Jl12 on the other hand does know how to compile apps in the .cia format and appears to have access to the DSi SDK from what i gathered from the email.--3dsguy 22:37, 1 November 2011 (CET)

This is the problem many people seem to have with the test units. From what I can tell, the only way to actually run some unsigned application (not created by Nintendo) is by programming it on a development flashcard. --Neimod 01:11, 2 November 2011 (CET)
I'm not sure why you deleted your previous post, but I agree that there are supposed to be different kinds of media (development flashcard, and copying from SD card to internal NAND) that allow running applications on a test unit. However, of these methods, only so far the development flashcard has proven to work with unsigned code. The problem lies in the fact that the unsigned development CXI image uses a dummy RSA private key to create the RSA signature, while official Nintendo development CXI images use the real deal. So as it stands, no developer can create proper CXI images for CIA importing. --Neimod 14:11, 2 November 2011 (CET)
  • I sent him 3 pre-compiled apps at first. ( all by Nintendo ). The first two don't boot because they're not compiled with the libs/firmware running on his test-unit. The 3rd TWL NAND app, doesn't have any icon/banner/title to identify itself after being installed, and although it imports/installs succesfully, it can't be selected or launched from Dev Menu or the Home Menu. Later, I sent him a self-built application ( one not by Nint. ), it installs, boots and runs properly and it just displays some information on the screens; those are the files and images he's linked to here. [the "Hello Galaxy!!!" test-application.]
  • They're not unsigned. Dev/test units use a different set of keys then the retail/production units do.
  • So as it stands, no developer can create proper CXI images for CIA importing. - What. I've sent self-built apps to test to 3dsguy and somebody else who owns a test unit running on a different firmware. They work fine. ( Although it's difficult to line up firmware revisions. )
  • The one that runs was made (compiled/built) using the SDK/firmware revision matching his test-unit.
  • He probably removed the 1st link because I asked him not to post anything with ( even potentially ) copyrighted contents for the sake of not getting this wiki associated with it, the binaries contained code from an e3 demo and the TWL/DSi SDK, we're not doing ourselves any benefit by posting it. The app that runs ( 'Hello Galaxy' ) is a self-compiled application, so it's probably not going to be mistaken for a game or another commercial application. [thus probably safe for wiki.] Jl12
Interesting. That's the first I hear about running self compiled CIA's on a test unit. And yes, sorry I said unsigned application, but I meant signed with the development RSA private key provided by the SDK. The official Nintendo development CIA's do not use keys from the SDK, but rather, a private one that is not distributed. --Neimod 02:17, 4 November 2011 (CET)


I had a look at your previous post, 3dsguy, where you have posted a download link for a CIA file. We don't know much about CIA files so it was interesting to see a file and look into it. The actual data for the app/tmd/cmd files seems to be encrypted (expected that) there's only some plain text like "Root"", "CA00000004" and "Root-CA00000004" to name a few (...) which obviously are paths on the NAND FS. However, I've found out that the name of the files/directories (eg name of the app file:"ad7e6744") which are saved on the SD card after installing the archieve seem to be in the CIA file: Not as plain text, they're actually hex values. I'm not really sure about that. It would be nice if you could post another CIA file, 3dsguy, that we can compare them and find out more about it. Shall we actually create a new page about CIA files?--Lazymarek9614 21:48, 2 November 2011 (CET)

They're certificates.
It's mentioned partially under "Download Play", because it's another use of the same file format. Jl12

Yes I think we should create another page made for .CIA file and move some of this page to its discussion page. But I've got another .cia file and and boots. see [[1]] for everything you may want to know about it and perhaps from this we can start a new page.--3dsguy 07:52, 3 November 2011 (CET)

I think this is more about getting our own code running on the 3DS/CTR then it is about CIA. Jl12

Lazymarek9614, those "paths" are from the cert chain and the ticket. CIA is based on WAD. --Yellows8 16:25, 3 November 2011 (CET)

If you are right and the format is based on WAD, then it might be little endian (unlike WAD). First there's an unknown byte (0x20) and then 4 bytes (0x20000000), which looks a lot like the header size in WAD (which is 'always' 32, in BE). So if this is the same field, I'm pretty sure it's LE. --lesderid 19:45, 3 November 2011 (CET)

@3dsguy - if the situation changes about being able to get any other test-units please let me know, thanks. Jl12

@Jl12: Do you have the Nintendo SDK? If so, can you upload it (correct me if this is a crime)?

If I did, I wouldn't be posting it here, see bullet #5 above. -Jl12
Oops, sorry. Maybe can you upload some more CIA files which differs in some cases only like the title name, icon etc.?--Lazymarek9614 18:20, 5 November 2011 (CET)

@--lesderid: "So if this is the same field, I'm pretty sure it's LE." I think it's HE. Is the header size actually 0x20 large? There's always a 0x80 byte after 0x20 bytes...--Lazymarek9614 22:09, 4 November 2011 (CET)

Who ever has the ip "151.26.190.77" living in Campobasso, Italy, stop probing the website where I've hosted the files. There are no SDKs on that website so stop trying find something that does not exist.--3dsguy 13:13, 5 November 2011 (CET)

Just a simple question, 3dsguy. In the CIA page you uploaded a CIA example. Can you upload also the binary format uncrypted,please?--Jocopoco 07:42, 18 November 2011 (CET)

@Jocopoco - you should ask Jl12 for it, it's his app after all. If he asks you which one it is it's this one "JlTestApp - test_02.cia"--3dsguy 17:39, 18 November 2011 (CET)

Jocopoco, that CIA isn't encrypted at all, just use ctrtool to extract the CXI and ExeFS.(and anything else) --Yellows8 18:44, 18 November 2011 (CET)

Sure? In the content folder there is a file named [id?].app it's encrypted I cant find anything, arm opcodes, text plain --Jocopoco 19:09, 18 November 2011 (CET)

That .app CXI is encrypted the same way as titles downloaded via eShop stored on SD card for retail 3DS,(besides different keys) the sample.cia is cleartext. --Yellows8 20:37, 18 November 2011 (CET)

@3dsguy: About the SHBIN in romfs.bin. Have you ever found there is .shbin inside it? Look at which you uploaded to dropbox (today or yesterday, named "CIA") and find that one in folder "CIA\Extracted CIA Content\CXI extract" and check offset 0x10C0. There is SHBIN name "font_RectDrawerShader.shbin" just above the offset (with 00 padding, also with the length of name 0x3a). There is also some other clear text. you can extract the file in hex to check the shbin (maybe 0x3A0+0x8/0x18, of that file). if you think there is chance to check those shbin, you may have to fetch some different CIA that generated and decrypt and then extract its Romfs. i will be eager to see the extracted decrypted romfs. If there is the proper source code of those files that may be even easier to check the function's ASM. (well best way is use dev unit to generate a series of versions of the title and extract all CIAs and decrypt to check those shbins) --Syphurith 05:07, 28 March 2013 (CET)

Syphurith, I knew about the .shbin in the RomFS. I've updated the archive to include it. It's not a particularly special file, I've seen it in lots of CXIs. You know you can use ctrtool to extract and view everything in the .CIA file, as it is a debug CIA. If you want the application's executable code, then you should look in the code.bin inside the "exefs_extracted" directory.--3dsguy 07:07, 28 March 2013 (CET)
@3dsguy, thanks for the information. well is there any way to check the relations that between assembly and source code? well i found those in exefs is salted (ie 0x5A03, with 0x00 0x10 0x20 chars. so if there is some source code of that CIA, the analyse can be even easier)(Since it is salted we may find out the salt hex and can make a tool to filter them all out). BTW, please take a look at these below:
  • Generate CIA series with Dev Unit (i mentioned above) and decrypt and try to compare those generated to see the assembly.
  • Decap the chip and try to gain the Creator Power and we can take down Home Menu then (but there should be lots of work to do).
  • Check all the potential storage media to look for 3ds Common Key, and use that and cetk of firmware on CDN to decrypt the firmware and check if there is any exploits that patched so the devices with lower version would have a chance to break in.
  • Crack the storage chips and use something like a proxy to record all the data streams to a prepared storage (or to PC)
  • Or simply let us wait for some progress?
You need to read up on the 3DS file formats, and boot order. It's nowhere near as simple as that.--3dsguy 07:59, 2 April 2013 (CEST)
I know there is a page of how 3DS got boot up (haven't found one telling me how a title got launched). Well i think i should try to read those documents (especially those has 'boot' or those word) again. --Syphurith 09:33, 2 April 2013 (CEST)
I hope you can get some inspiration and find a new way. Well i'm wondering about where could be a 'CTR Common Prod 1' key stored. (if that can be written somehow, we may be able to cheat the system (if we can get its private key from device and use that for decrypt, sorry) I check those "CTR Common Prod 1" of my Japanese 3ds and one Usa 3ds of my friend, and found there is nothing different in hex. if you need more detail about that, pm me.) is that still more important finding the way? --Syphurith 09:50, 28 March 2013 (CET)
You won't find the 3DS common key by analysing 3DS communications. The common key(s) are stored in two parts, and scrambled, deep inside the 3DS.--3dsguy 07:59, 2 April 2013 (CEST)
That's right (yellows8 edited 'ClCertA' page and i knew that days ago); i've given up finding one without hardware help (now waiting and also learning some basis about hardware methods from Hackmii). Thanks. --Syphurith 09:33, 2 April 2013 (CEST)
I tried to check the 'exefs.bin' in your archive uploaded, and found it not easy to analyse. There're many things seems to be timestamps (that WinHex told me).. and those text inside are merely readable (but you can get 'NULL' or something else like 'Mem' or 'display'). I tried hard to get some but found that not useful as a clue. Also the header and reserved in exefs are 0x180 length now. If you can get many decrypted exefs.bin please tell me (especially those on a same branch of source code), thx. Well hope you get progress everyday. --Syphurith 07:22, 2 April 2013 (CEST)
That is the decrypted ExeFS, BTW the ExeFS format is already reversed. You will probably find it hard to make anything out of the code actual game code, as it is a dissected version of an ARM ELF.--3dsguy 07:59, 2 April 2013 (CEST)
Oh.. Thanks. I may try to find another way. (sorry for my being noob, that is really not easy) --Syphurith 09:33, 2 April 2013 (CEST)
That ExeFs seems to need decoding before trying to get anything from it (via disassemblers). So no usage now indeed (regarding yellow reading those in memory..)? or maybe we will need a customed disassembler dealing these for us? --Syphurith 17:15, 21 June 2013 (CEST)

Add me! 0662 - 4312 - 7555[edit]

Add me! 0662 - 4312 - 7555