A Work in Progress Save Editor, currently it only to modifies rupees, durability of weapons & arrows.
Currently it only works in v1.5.

• Use Checkpoint to extract your Save File to your SD Card, name the folder "botw".
• Open the Save Editor and select your save file slot.
• Use DPAD UP/Down to Increase/Decrease the integer.
• Use L/R to move between items.
• Press A to Commit Changes.
• Restore Save File using Checkpoint.

• Use LibNX.

• Mount within the app the save file.
• Make backups for the save files.
• Add more items.
• Create an UI.