Fly Gemini bootloader serial cable
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Building the serial cable
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The serial cable needs to connect the ZH2 and screen1 headers
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ZH2 RX to Screen1 TX
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ZH2 TX to Screen1 RX
Serial Cable ZH2 header 
Serial Cable screen1 header -
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Crimp the JST-XH connectors on the included 4 pin pigtail connector. The wires should be long enough to reach but you can extend them if you feel the need.
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Remove the extra 2 wires or tape them off as they connect to +5v and ground on the ZH2 header.
Serial Cable installed
