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I am attempting to set up a TK-790 and TK-890 for dual Band single head set up. The Tk-890 is set up for radio 2 and the 790 is set up for Radio 1. Initally the Head unit got no power. I was able to jump the poser for the head from the 12 pin connector on the back and everything powered up. The Speakers will not work from the back of the head unit, only from pins 2 and 6 on the back of radio 1. when switched to the 890 it beeps constantly when I switch back to the 790 it is fine. When I go to program them it tells me that the models are wrong and would i like to over right them. Then the incesent beeping starts again. What am I missing. This is the first time that I have ever set this up and am having issues with it. I may need to change the firm ware on both radios but what is the latest version and where do I get it. Someone please help I am kind of a rookie with this stuff.