Well glad you sorted it but the error: HDR block not accepted,error:101D is normally associated with a corrupted header of the firmware.
Oh and btw, Antivirus software will always detect A2uploader as a virus. It isn't. the_laser uses some sneaky techniques to protect the loaders and av software think its a virus. So it's always a good idea to add A2uploader.exe to your av's exceptions list or simply turn it off before running the exe.