I AM HAVING PROBLEMS UPLOADING MY DEVICE TO MY PC, IT GIVES ME A MESSAGE SAYING THAT COM PORT ONE IS OPEN,BUT NO RESPONSE FROM RC DEVICE. I HAVE TRIED USING AN USB/PDA ADAPTER AND AN USB/SERIAL ADAPTER, AND NONE OF THEM SEEM TO WORK. I HAVE TWO PC'S ONE HAS WINDOWS ME AND THE OTHER HAS XP. IT GIVES ME THAT SAME ERROR MESSAGE ON BOTH COMPUTERS. I HAVE TRIED CALLING MARANTZ TECH SUPPORT, BUT THEY SAID THEY WILL CALL BACK AND I'M STILL WAITING. HAS ANYONE HAD THIS PROBLEM BEFORE, AND IF SO HOW DID YOU DO IT? I DON'T HAVE A DEFECTIVE DEVICE CAUSE IT WORKS, I JUST CAN'T GET IT TO WORK ON MY PC.