Homebrew Difficulty with Smash Bros 3DS saves

[Picasso-Jazz]

I have tried using edited saves and already 100% completed saves to get all the custom moves in this game, but whenever I restore one of the saves with Checkpoint (system_data.bin) it says there is an SD Card issue and I have to restart the game for it to try creating extra data again. Despite over 22K blocks of space it says there is not enough space whenever I try to create extra data. Here is the order of events:

1) Put system_data.bin of an edited or complete save on my 3DS.
2) Restore ONLY system_data.bin (not account_data.bin) using Checkpoint.
3) Series of messages when I start the game:
Not enough free space.
Extra data will be created for this software on the SD card.
An SD card error has occurred.
The game cannot be started because the SD card and/or extra data is unavailable.

Is there any way to stop this? I just want to mess around with customs without spending a week grinding for them.

Edit: I probably should have mentioned this from the start but yes I did try with restoring the account_data.bin

 

[ReapyRaptor]

Is it still not working? If you need help what you need to do is:
1. Download the save_data of the save you want
2. Make a copy of your current save using checkpoint (make sure you have 2 backups)
3. Remove your micro sd
4. Insert it into your computer
5. Go to the checkpoint folder saves
6. Click on the smash bros folder (in your case)
7. Choose one of the files and remove the current save_data
8. Paste the save_data you want
9. Eject
10. Open checkpoint, restore the hacked save file
11. Open the smash and profit