My question is, with all the different models. Just what is the difference if any between model a-b-c- and model E for instance. My model "E" will not work with my plain UV-5R.

The dealer I bought it from is saying that I need a cable specific for this model.

Is this untrue? Is there a difference that demands another cable? If so what newer model should I get as I try to return the two I bought for a friend and myself.

Very Disappointed

Thanks

Alan