12/23/2020 Nintendo 3ds Master Key Code Generator
mkey is a master key generator for the Parental Controls functionality on various consoles from a certain vendor. Currently, this includes the Wii, DSi, 3DS, Wii U and Switch.
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Nintendo 3ds Master Key Generator
This allows resetting Parental Controls (due to being locked out) without having to contact customer support.
If you would just like to use this, with no concern for the code or how it works, visit: https://mkey.salthax.org/
v2 support was initially implemented in October 2015, and has been serving the above page since December 2015. v1 and Wii U support was added in January 2016. v0 support was added in April 2016. v3/Switch support was added in July 2017. v4 support was added in April 2019.
Python and C implementations are available in this repository. These function very similarly.
As of writing, system support is good - all algorithms in use are supported, provided one can extract the necessary keys from the system firmware.
For some algorithm versions (especially 3DS v2) many keys are required from the system firmware in order to generate master keys. These can differ between regions and system versions. The best documentation for these is in the code, which covers the situation on all supported devices.
The v4 algorithm on the Switch and likely any future algorithms also require a console-unique device ID stored on the system that Nintendo can retrieve using the separate, visible serial number one must provide via the support call. The security in this relies upon the device ID being hard to obtain by simply using the device. This would make the generator more of an academic exercise rather than a practical tool.
Some 3DS-specific documentation on the algorithms seen so far can be found at: https://3dbrew.org/wiki/System_Settings#Parental_Controls_Reset
License
mkey is distributed under the AGPLv3 license, see LICENSE.
ctr.c, ctr.h, utils.c and utils.h are taken from ctrtool, which is licensed under MIT, see LICENSE-ctrtool.
Credits
System Settings allows you to manage various settings, use System Transfer, and use Data Management.
All applications(CTR/TWL) launched by System Settings are launched via APT:PrepareToDoApplicationJump/APT:DoApplicationJump, such as DS INTERNET and System Transfer.
Accessible services[edit]
Data Management[edit]3DS[edit]
Here you can manage 3DS extra data, and 3DSWare/'Software'.
When managing 3DS Software installed to the SD Card, the title.db is read by the core receiving AM commands. From the title.db file, AM gets a list of installed titles, title sizes and the name of the '.cmd' file for each title, which is used to check the authenticity of the title data(product code, title version, and if an electronic manaual is used, is also kept for each title, in the title.db, but won't be used by the Data Management Utility). For each title listed, it checks if the title is authentic(via the .cmd file). If the title passes authentication, Data Management decrypts/reads the ICN data from the executable NCCH(CXI) and displays it along with the archived title size. If a title doesn't pass authentication, a placeholder icon(light grey with a '?' in the center), name ('????????') and a size of zero are used. Deleting titles removes the title data from the title.db and import.db, and deletes the directory of the content.
DSiWare[edit]
See DSiWare Exports.
System Format[edit]
Most of the System Format is done with FS:InitializeCtrFileSystem. This command updates the high u64 of the keyY stored in movable.sed. Since this keyY was updated, the data stored on SD card(sdmc/Nintendo 3DS/<ID0>/<ID1>) and the data under nand/data/<ID0> is rendered useless, since that data used the old keyY. Since that data is no longer usable, the system then deletes the two above SD/NAND directories.
Nintendo 3ds Master Key Code
When you first enter the System Format menu, it will check if a NNID is linked. If there's a linked-NNID, it will then display: 'Are you ready to connect to the Internet to check whether data can be formatted'? Continuing will only result in connecting to wifi for checking in with Nintendo's servers, which may fail if the console is banned. Once that's done it will continue with the usual system-format messages; proceeding will result in the NNID cookie, potentially still present on NAND backups or multiboot scenarios, being invalidated until the next sign-in (at which point even old sessions will be valid again).
System Updater[edit]
The system updater title is identical to the regular system settings, except only system update is accessible with this. On dev units, this title can only be launched under certain conditions.
On retail units, this title is accessible in scenarios where you have to update via the Internet to use certain 3DS software other than the home menu. i.e. using the eShop, on a system version less than the current one. When one selects 'Cancel' from here on retail, the system will shutdown. NS launches SAFE_MODE_FIRM for running this title, when the UPDATEFLAG is set during system boot.
Exiting System Settings[edit]
Upon exit, the system reboots instead of simply returning to home menu.
Parental Controls Reset[edit]
Download receiver for mac. Free drum loops garageband mac. The following refers to the functionality which generates the Parental Controls 'Master Key'.
ExtData[edit]
The ExtData File System for System Settings is as follows:
MsetExt.dat[edit]![]()
This keeps a record for the DSiWare Exports for a maximum of 300 exports. Each record is in the format:
All unused entries are filled with '0xff'.
Backup.dat[edit]
This keeps a record for the 30 save data backup slots for SD Savedata Backups. Each entry corresponds to an individual backup slot.
Entry:
Launch parameters[edit]
System Settings can start at specific menus when certain parameters are given.
* - returns to settings menu instead of rebooting
Retrieved from 'https://www.3dbrew.org/w/index.php?title=System_Settings&oldid=20366'
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