Trying to follow the unlockr guide, was able to winimage to my 4GB MicroSD card successfully, but when I put it in the Nook and plug the nook USB into my computer...nothing. Wait 5 min - nothing. remove USB cable, try to boot - nada. Remove SDCard, plug in USB, boots into factory NC image. Kinda stuck at this point, any ideas what to try? This is an older MSD card, could that be an issue (does it have to be a class 6 or 10)?