Restoring saves with r4i

[Nintenfreak]

So for my brother's birthday I though I'd modify his save in heartgold so he could exploit the cutecharm glitch. My r4i dongle dumped the save just fine but going to load it back, the dongle keeps failing. Now there's no save data on the game at all. Apparently this is a known issue but I can't find a solution. Any help? I know if I had a modded 3ds I could probably restore the save but I don't have one. It's there a better device I can purchase? 

[SkyLink98]

Your best bet would be either a hacked DSi or a hacked 3DS.

If you can't use an hacked device, you can eventually also look into this https://github.com/AdmiralCurtiss/nds-savegame-manager, but it's not much user friendly and it requires you to have an open or WEP encrypted WiFi network.