un ch'ti truc (je me souviens plus où je l'ai trouvé, sorry) qui permet de sauvegarder l'eprom avant de l'écraser (en anglais, trop pourri pour traduire... tout ce que je peux dire, c'est que ça marche nickel) :

You need to have a GBA game that is save patched on your SC. Do this using Super Card Software V2.40. Use a small 4mb game (that has a save) I used Ninja 5-0 (like Blue with the ScummVM example).
You will now have 2 new files on your SC a .gba and a matching .sav file.

To Backup.

1) Boot DS into DS mode (using flashme/passme).
2) Select EEPROMTool.nds
3) Press A and wait for "Backup Finished" to appear.
4) QPC into GBA mode. i.e off/on quickly.
5) Select Start GBA Game (to boot o the SC menu).
6) Select Saver menu.
7) Select the same game from above.
8) EEPROM save is now on the SC CF/SD card.
9) Optional Step : Check the data out on the PC see if it looks good (Use a hex edit).


To Restore.

1) Boot DS into GBA Mode.
2) Load the save patched game (In my example Ninja 5-0)..
3) When it has finished loading press L+R+A+Select to enter the SC saver menu.
4) You will see SC Normal save Save Load. Select Load and then Yes on the next screen. This will load the NDS save game into SRAM.
5) Now the hard bit. QPC into DS mode. You know you have done it correct if you see xxxxx (in card) at the top of the menu. i.e. the GBA game is still in the memory of the SC and as such the SRAM.
6) Select EEPROMTool.nds.
7) Press B and wait for the "Write Done" to appear.
8) EEPROM save is now back into the DS card.

un lien vers le fichier : http://users.skynet.be/keyser.soze/EEPROMTool.zip

si ça peut aider quelqu'un à ne pas bousiller ses sauvegardes, tant mieux !