I had the same situation with my 6100. I had it for a few months but only used the receiver. Once I started trying to transmit with it I found no output, all bands, all modes. I worked with my dealer (Radioddity) and they wound up sending me a replacement unit under warranty. My replacement works fine, all bands and all modes.
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Sadly I can offer no information as to the root cause of the problem. Others in this group who had a similar problem stated that they solved it with a firmware update. This solution did not solve my problem. Good luck!
