You are right, of course, but the diamond and the TP are not that different... I just hope hardware wise everything is in place, and I believe we should start with that assumption; the manual is pretty clear about this. If they were only supporting flashing from external sd-card reader, they would have just said so. At least that's what "usb 2.0 host suport thru dongle" means to me... Then again maybe the "dongle" is something special, more than just rearranged pins and externally supplied power...
i agree with you but i bought a mini usb y cable and tried it out but it did not work. I realize that it could just be me but i can confirm that power was getting to the usb drive so not sure why it did not work for me