TWLSaveTool 3DS

TWLSaveTool is a 3DS homebrew that allows you to read, write, and erase save files from NDS cartridges (just like savegame-manager).

Installation

Available in CIA and 3DSX/SMDH formats.

CIA - Requires an access to CFWs. Recommended option (and you get to see the banner made by Apache Thunder).
3DSX - Must have either PokéTransporter or Pokémon Dream Radar installed on your 3DS. In both cases you'll need to pay to be able to download them.

Have libctru and devkitARM correctly installed and set up, as well as makerom and bannertool in an accessible path, then run: make

All NDS games should be supported except:

After creating a backup save file, it is always recommended to keep a backup of this file before importing or editing it with any save editors.
Make sure the newly created save is in the TWLSaveTool folder on the root of your SD card (not in /3ds/TWLSaveTool), and it has the exact name showed on screen. Otherwise it will not reconize your save file.

B - Backup save file

A - Restore save file

X - Erase save file

Start - Exit

Y - Restart

Left/Right - Change filename

Backup your nintendo ds game saves on CFW 3ds (GTS 2018)

How To Backup 3DS/DS Saves and Cartridge Roms (The Boolean Gemini)

v1.2 2016/08/28

v1.1 2016/02/07

Doesn't work with PMD EoS.
Added a (very simplistic) file selector.
Changed the key layout (pull request #5, thanks @lavanoid).
Fixed glitched text issues, as well as other bugs.
Simplified the build system. You just have to run make now (pull request #6, thanks @WinterMute).

v1.0 2016/01/31

Special thanks to:

Current contributors.
Apache Thunder, for making the amazing banner and icon used by this homebrew.
Steveice10, for having RE'd PXIDEV:SPIMultiWriteRead.
idgrepthat, for pointing out that PokéTransporter was indeed using that function.
Everyone else who helped.