It's quite obvious you got a faulty cart. Either contact the retailer you bought it from or TeamCyclops for a replacement.
QFT
Yeah, sounds like you may have gotten a dud. But you might want to walk through your steps one more time:
1. Download the firmware.
2. Extract it to your microSD.
3. Put the SD in your card, and boot the card on your DS.
Go slow, and make sure you've got everything slotted properly...no offense, but I've seen some vids of folks putting the SD in the wrong way, believe it or not.