This is a basic EEPROM backup tool. Basically it lets you copy the save-games from your commercial game carts back and forth to your flashcart. It also supports using SRAM as storage, and if you have a gba cart in slot-2, and a flashcart in slot-1, you could copy the sram off the gba cart to your flashcart.
It has various transfer functions, basically what you see in this screenshot:
Hexdump is not implemented yet.
Download it here: eepinator.nds
UPDATE:If you’ve got only a slot-1 card, this tool may be useful to you:
savesender — site appears down. Try this local mirror:
It uploads your saves via WIFI to your pc, eliminating the problem slot-1 flashcard from the equation!