I just received my Gateway card today. Dump two of my retail carts so far, Mario 3D Land and NSMB2. I used the backup savegame function in Gateway on both games (both savegame files are 128K). Renamed my ROM dump to .3DZ extension. When I started NSMB2, it said save file corrupted, press A to delete. When I started 3D Land, it did not recognize my savegame at all.
I'm still not 100% sure how this is done, to backup the savegame from my own retail cartridges and play it after I dump it from the Gateway. Appreciate any input on this.
PS I 100% both those games long ago
I don't mind replaying them, but I have 15 more carts to dump and not all of them are finished. Would like to continue the games from the dump.