Edit 3ds games save file
- Extract your save files with a homebrew (JK's Save Manager or other)
- Open your save files in various save editors, edit
- Re-import your save with a homebrew (JK's Save Manager or other)
https://github.com/Brionjv/3DS-Save-Editors-Library/releases
https://gbatemp.net/threads/release-3ds-save-editors-library.518626/