[gambatte]

So you are sure everything is kosher on the PC side. When you connect the 6700 you get the "ding" and when you look in device manager you see "mobile remote adapter" or something like that under network adapters? And "HTC USB sync" under mobile devices? Have you changed the 6700 device name and not deleted/recreated the partnership? Don't use a USB hub. Still could be a bad cable, I guess. That's about all you can do. I don't think you can boot from the SD card as it would need the ROM; I've heard of flashing from the SD card. I don't know if the USB drivers are around in .CAB format.