Hacking Copying GBA save files

[Myria]

How do I copy my GBA VC save files from one system to another? I have the Ambassador set on my main system and want to copy a save file to a capture-carded 3DS for streaming.

Checkpoint doesn't show the GBA VC games.

 

[npbg6464]

How do I copy my GBA VC save files from one system to another? I have the Ambassador set on my main system and want to copy a save file to a capture-carded 3DS for streaming.

Checkpoint doesn't show the GBA VC games.

You can copy the decrypted save file from your game's title ID folder with Godmode9 from [A:\title\<gameIDHi>\<gameIDLo>\data\00000001.sav]. You can also get the raw GBA save (for use with emulators, etc) from [S:\gbavc.sav]

 

[N7Kopper]

Tools like Checkpoint use the same functionality as the developer SDK's tools for managing save data, and they don't work with GBA titles. (NTR and TWL functionality, by the same token, doesn't yet support WarioWare: DIY's unique save hardware)

Godmode9 uses its own implementation, and therefore it does.

 

[Myria]

You can copy the decrypted save file from your game's title ID folder with Godmode9 from [A:\title\<gameIDHi>\<gameIDLo>\data\00000001.sav]. You can also get the raw GBA save (for use with emulators, etc) from [S:\gbavc.sav]

This did not work. After I copied the file, running the game on the other 3DS thinks that the save file is corrupt. I copied both "from" and "to" the A: drive so that the SD-level encryption wouldn't be a problem.

There's probably a MAC in the header I need to fix somehow.

 

[redunka]

Copying the save from/to AGBSAVE partition is probably the only way to manage them, at least for now.
That's a bit inconvenient, as the saves can only be copied one at a time (the partition stores the save for the last launched GBA title).
Here's a guide for that method, if you need it: https://3ds.hacks.guide/godmode9-usage#backup-gba-vc-saves

 

[npbg6464]

This did not work. After I copied the file, running the game on the other 3DS thinks that the save file is corrupt. I copied both "from" and "to" the A: drive so that the SD-level encryption wouldn't be a problem.

There's probably a MAC in the header I need to fix somehow.

Try deleting the secure value for the title with JKSM on the target device after copying the save. If that doesn't work, probably the only way is what redunka posted.