System Settings

From 3dbrew
Revision as of 08:13, 21 September 2013 by 3dsguy (talk | contribs)
Jump to navigation Jump to search

System Settings allows you to manage various settings, use System Transfer, and use Data Management.

Data Management


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.


See DSiWare Exports.

System Format

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.

System Updater

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.


The ExtData File System for System Settings is as follows:

├── icon
├── boss
└── user
    ├── Backup.dat
    └── MsetExt.dat
File Details Size FW Introduced Plaintext
icon Stubbed, Always image 00000002 0x4 Bytes n/a
MsetExt.dat DSiWare Exports Management 0x960 Bytes 2.0.0-2 Download
Backup.dat SD Savedata Backups Management 0xf5a0 Bytes 6.0.0-11 Download


This keeps a record for the DSiWare Exports for a maximum of 300 exports. Each record is in the format:

0 4 Game Code in Little Endian
0x4 4 Reserved

All unused entries are filled with "0xff".


This keeps a record for the 30 save data backup slots for SD Savedata Backups. Each entry corresponds to an individual backup slot.


0x000 8 Reserved
0x8 0x800 (0x80*16) 16 UTF-16 Title Strings
0x808 8 Title ID
0x810 8 Unknown
0x818 8 Total Save Data Size
0x820 0x10 Reserved