I have 3, TK-5710's that came with no head, but have a KRT-11 remote interface on the radio, but no controller. I have tried both kch-14/15's but cannot read radio. All seg's are on, and I think the radios are looking for a control head I do not have. Is there a way to "factory reset" or work around to change the type of head the software/ firmware is looking for? I have connected both kch-14/15 heads directly to the radio and no success. The heads work on other radios. Thanks!