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I bought a used MD782 VHF radio and it has version 5.00.15.001 in it now. I have the upgrade file to bring it up to 7.00.11.010 and the next upgrade file to get it to current version but when I put the radio in upgrade mode and connect the cable my computer does not recognize the USB cable. I can read and write just fine with same cable and same port, but when the radio is in upgrade mode it will not connect so I tried my other computer and it does the same thing. I have done several firmware updates and had no issues with this same set up is there something different I have to do with firmware this old, I have never had a radio with this old version before.