3DS Development Unit Software

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The following is a description of the functions where possible of the applications unique to 3DS Development Units. Descriptions Derived from SDK revision 37904. For information of 3DS Development Hardware see [1]

Beautifully clear picture of the Dev Apps + Home Menu. Click to view in great quality. - Xcution

Dev Menu


Dev Menu Screenshots

This application on the top screen displays the current firmware and revision, the free space available on the TWL DSiWare NAND partition and on the SD card if present. It also provides information on the current file or device selected, as well as navigation instructions for the bottom screen.The bottom screen has three different windows, which are:

  • Programs- From this window, applications can be loaded from the nand, the SD card and the slot 1 card. This is shown in the format of "'unique id' '(name of application if stored on nand/sd card or device type if loaded from slot 1)'. Applications not on a slot 1 card can be deleted from this menu
  • Import- From this window, applications (compiled to be installed) in the format of a .CIA file(see CIA) can be installed from an SD card.
  • ExtData- From this window, the 3DS's ExtData can be deleted

(Note that retail 3ds games are not recognized by Dev 3DSs and prints "Unknown Card" in the 'Programs' window and shows no details on top screen)



Config Menu Screenshot

This application is a configuration menu for the 3DS, which has the following options:

  • Reset Settings - Resets all settings to default.
  • Hid Setting - (human interface device) Calibrates Touch-Pad and Analog stick.
  • Rtc Setting - (real time clock) Sets system time.
  • Lcd Setting - Sets display settings as found in the home menu as well as Flicker settings.
  • User Info Setting - Allows username change and "NG NAME FLAG" to be set to true or false.
  • Other Setting(branches off into other settings) -

->Sound Mode- mono/stereo/surround

->System Mode- Locked to "Prod" for unknown reason (it seems to be refering to memory allowance for 'prod' which is 64mb).

->Exception handler- enable/disable

->Break Stop (?)- enable/disable

->Menu- (Home Menu/Test Menu) The test menu is an alternative to the 3DS' main GUI the 'Home Menu' See 3DS GUI for more info on this

->Language- same as in system settings but also has an "invalid" option

->Dlp Force Child Import- enable/disable - normally the 3ds caches downloaded "Download Play (Dlp)" applications on the nand and only re-downloads, overwriting the cached copy if the version application being requested to downloaded is higher than what is currently present on the nand. Enabling this option forces the 3ds to download and overwrite the cached copy on the nand, regardless of the version of the application being downloaded. This is of course for testing purposes.

->Debug Mode- enable/disable (I am not sure what this does)

  • Test Setting - Test calibration of touch pad and joystick
  • Eula Setting - Allows user to change "Agree Version" namely:"ff.ff" the two symbol sets are interchangeable with combination variations from aa to 99 (default is 00.00 where the Eula is not accepted yet).
  • Stereo Camera Cal for Check - Camera test (?) as options to "write strange data(excess Z-rot) and "reset to factory default".
  • Gyro / Accel Cal for Check - Allows Gyro and Accelerometer to be calibrated.
  • Ctr Info Setting - Changes settings to that found on the ctrsetting.txt on an SD .

Downloadplay Client

Downloadplay Client Screenshots


Even though a Developer 3DS has a "Download Play" application visually identical to the retail 3DS application, the "Downloadplay Client" application can be installed as an alternative to the regular Download Play application. (Note: a Developer 3DS' and Retail 3DS' cannot receive download play 'children' from each-other.) This Developer application is a stripped down version of 'Download Play' which has the following options and limitations:

  • It can only download 3ds download play titles
  • Scraps the GUI found in the normal Download Play application(see screenshot)
  • Can select from a maximum of 16 Download play 'servers'

This application is clearly used for easy testing of download play 'child' apps, without the hassle of constantly re-navigating the normal Download Play interface

Network Settings

Network Settings Screenshots


This Developer application allows the users to directly modify the following from any of the three possible network setting 'slots'

  • Security Mode :(the wireless encryption the network is using) OPEN/WEP 40bit/WEP 104bit/128bit/WPA TKIP/WPA2 TKIP/WPA AES/WPA2 AES
  • SSID :(self-explanitory) maximum 32 characters
  • KEY :(the key for the encrytion is here in plain text) the maximum length depends on encryption type
  • AutoDNS :(whether the 3DS obtains the DNS automatically or not) |True-3DS obtains the DNS automatically|False-3DS uses the DNS server address provided by the user(it is possible to edit this here)|

At the bottom of the setting options there are two choices:

  • Write Setting & Connect Test To AP - Applies the settings above and performs a connection test(note any settings made in system settings for this connection, which are not present in the above settings will be nullified, for example any proxy server settings)
  • Remove Setting - removes all settings for this 'slot'


SaveDataFiler Screenshots


This 3DS Developer application allows save files and extdata to be exported and imported from an SD Card. The window has three tabs:

  • User - This is where saves for 3DS applications and saves on 3DS Game Cards(not DS Game Cards) can be exported to the SD Card. Saves cannot be deleted here.
  • ExtData - This is where application extdata can be deleted or exported to the SD Card for later use
  • SD - This is where extdata and application saves on the SD Card can be imported to the 3DS or 3DS Game Card. Also extdata and application saves can be deleted from the SD Card

CTR MenuSelector

Menu Selector Screenshot


This application when loaded can change the current 'Active Menu'(being used at the moment) to an alternative Menu (these menus being the 3DS' main GUIs). Namely Home Menu/Test Menu. This application was probably superseded by the introduction of the "Menu" choice in the Config Menu and consequently removed as a standard application.


CecLotcheckTool Screenshot


This application is used to manage CECs (Chance Encounter Communications, AKA StreetPass hits) for any of the twelve possible applications used on the 3DS, if there are any. The application has twelve possible slots which can be filled by BOXes . The BOXes are individual applications which are permitted by the user to use CECs, such as StreetPass Mii Plaza or Nintendo 3DS Sound. And as such, the boxes in this application correspond to the applications in 'StreetPass Management', in 'System Settings' (StreetPass Management is accessible from retail 3DSs). The functions of this application:

  • <Y> BOX Options - this opens up a sub menu with the following options(when hovering over Nintendo 3DS Sounds BOX - the only one I can test the app with):
  • Box Info - Gives the Out-Box parameters Boxinf.jpg

  • Message Info (OUT-BOX) - Gives the Message Parameters For the current BOX Mesinf.jpg

  • Dummy Message Settings - Not quite sure what the options do here Dummesinf.jpg

  • <A> Create Dummy BOXes - Creates dummy BOXes to fill any unused slots. (does not overwrite any present slots)
  • <X> Delete BOXes - Deletes all of the BOXes from the slots.
  • <START> CEC Filter Reset - I can only guess that it erases data collected by CEC enabled apps.


BossLotCheckTool Screenshot


This application is used to manage 3DS applications registered for BOSS (SpotPass) communications. 'Pokedex' is an application which utilizes BOSS comunications. This application also displays the 3DS's friend code, although this code is not to be confused with the 3DS's Friend Card code found in 'Friends List'. Unfortunately there is not much more on the functioning of this application, as I do not have an application for developer 3DSs which utilizes BOSS communications.

Stereo Camera Calibrator

Stereo Camera Calibrator Screenshot


Coming Soon...

Friend Testing Partner

Friend Testing Partner Screenshot


The Friend Testing Partner application is used to test/monitor the 3DS's Friend List function. It allows the user to test various functions of the 3DS's out-going Friend Card, by giving the following options:

  • Master Control - (RUN/STOP) (STOP is the default setting) when ‘STOP’ is selected the 3DS Friend Card uses the user’s settings/data. When ‘RUN’ is selected the 3DS Friend Card uses the dummy settings/data chosen to test from the settings bellow.
  • Login/Logout - (ON/OFF) (ON is the default setting) What effect this has on the Friend Card is not known
  • Playing Title - (ON/OFF) (ON is the default setting) When ‘ON’ is selected the currently used title is ignored and a dummy applications are cycled through as the ‘Playing Title’ approximately every ten seconds in its place. The dummy applications used are the applications found in Firmware version 1.0.0-0 of a retail 3DS including the ‘Nintendo Zone viewer’ app. When ‘OFF’ is selected the currently used title (which is the Friend Testing Partner app) is used as the ‘Playing Title’
  • Mode Description - (ON/OFF) (ON is the default setting) When ‘ON’ is selected the Software in Use(Playing Title) is accompanied by the Date and Time found on that user’s 3DS. The Mode Description is refreshed every ten or so seconds. When ‘OFF’ is selected the date and time on the user’s 3DS is not displayed.
  • Message - (ON/OFF) (ON is the default setting) When ‘ON’ is selected the message made by the user is replaced(not overwritten as it reverts back to the user’s choice when this is ‘OFF’) by the current date and time in the format “YYYYMMDD HHMMSS”, this is refreshed every ten or so seconds.
  • Mii - (ON/OFF) (ON is the default setting) Assumingly it would replace the currently used mii with a dummy and cycle through every ten seconds with a new mii. But this does not happen as the Mii does not change on the Friend Card.
  • Favorite Title (ON/OFF) (ON is the default setting) When 'ON' is selected, the user’s favorite title is replaced with a dummy, but the effects of this on the 3DS' Friend Card cannot be seen until the user views the friend card with no application running.(that is the only time the favorite title can be viewed)

Also this application allows the user to monitor the whether the 3DS is online or not and whether the 3DS’s Friend Presence is online or offline. Every time a dummy setting is refreshed it is displayed on the top screen with a time stamp.

Game Coin Setter*

Game Coin Setter Screenshot


This application is used to set the Play Coin count on the 3DS. Obviously this was created so a developer can test parts of their game in which the player can exchange earned play coins for in-game content or similar. It has a very simple interface showing the current play coin count and the adjustable option, the target coin count. These are the controls with explanation of each:

  • LEFT/RIGHT - using the D-pad only to adjust the 'Target Count' to a number between 0-300.
  • A - Sets the 'Current Count' (amount of play coins the system has) to the user selected 'Target Count' (the user specified amount of play coins)
  • L+R+X - "Preclude today's Increment" not sure how this affects the Play Coin count.

Uds Local Id Checker*

Uds Local Id Checker Screenshot


Coming Soon...


WMtest Screenshot


This application is a TWL(DSi) application compiled for use on the 3DS. It is an wireless test tool with its uses explained below:

  • Scan Test - Scans Wireless channels 1-13(can be focused on one specific channel) for broadcasting stations. It can detect two types of broadcasting stations:

Wifi Access Points - Giving the Mac Address, Broadcasting Channel, 'c', and the SSID

DS Stations such as DS Download stations and Pokemon distributors - Giving the Mac Address, Brodcasting Channel, TGID and GGID

  • ScanEx Test - and has two Scan Types. Passive which lets you individually scan channels 1-13 (only one at at time) and the DS distribution channels (1,7,13 all at once). And Active which scans all 13 channels at once. when it finds a channel it prints on the bottom screen next to 'Found' 'bssDescCount='
  • MeasureChannel Test - not quite sure what this does but it for a given channel it gives a ratio(in percentage form), which it finds in its allocated test time ranging from 10ms to 1000ms. And for every interval of time which is specified, it tests and gives a ratio.
  • Noise Mode - Seeks wireless channels in which to make wireless noise (This is not made very clear on the app). You can specify the:

Channel where the scanner will seek to make noise

Noise Rate, ranging from 0% to 100%

Frequency, ranging from 10ms to 50ms

Seek Mode, ranging from 1000ms to 1500ms

When the settings are chosen the top screen has two counters which display 'Noise ON count' and 'Noise OFF count' the counters are affected by the noise rate. Starting at 0% the 'Noise ON count' does not change but as the Noise rate gets closer to 100% the count moves and gets faster as Noise rate reaches 100%. For 'Noise OFF count' it is the exact opposite to the ' Noise ON count' in regards to counting.

  • A substitute icon is used here in place of a generic icon (which the application uses) to stop confusion with other applications. The original generic icon can be viewed in the icon's history.