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how do I turn on the FM radio on my RT7 radio

Please install RT7 software and USB driver for Retevis website:https://www.retevis.com/resources-center Please programming RT7,here is the blog for reference: http://blog.retevis.com/how-to-program-rt7-software/, After install software,please click"edit-optional feature-FM",select "Enable". Please try it.
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