If anyone is interested in a firmware flashing cable # NNTN6367A, there is one listed on an EBay auction at the link below: As of this posting there is slightly over six days left on the auction.
I have several DTRs (410, 550, 650) around. I believe they are with old firmware. I am at San Francisco Bay Area. Anyone nearby who has the cable and is willing to help me out? I can pay some fees.
I agree, but how much would you pay for a bottle of water in the desert? People charge what they can get.
The flash cable is only for updating the firmware. The CPS cable (which is still easy enough to find) is used for programming the radio. Please read my “Start here” thread and have a look at the manual for more information.