I've tried everything and it seems that my USB Rubber Ducky just doesn't read any sd cards.
By everything I mean:
Tried 4 different SD Cards;
Resetted the firmware using ducky-flasher;
Changed the firmware from the original to Twin Duck;
Tried different USB ports;
Tried formatting the SD Cards (FAT/FAT32);
Tried with empty SD Cards
Tried with different inject.bin payloads;
Tried with different Operating Systems;
And finally, tried changing laptops.
The Rubber Ducky is brand new, arrived a week or so ago and it work