I bought the USB Rubber Ducky, and it appears that I cannot get it to go into DFU mode. After taking the Micro SD card out, I hold the black button and stick it into my PC, but all I see is a solid red LED on the Ducky. I'm trying to get it to go into DFU mode so I can get Twin Ducks but the DFU mode isn't working. Any help would be greatly appreciated.