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Author Topic: RX and TX led always on.  (Read 60 times)
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Hi everyone, working with serial communications sketch (via USB) my Arduino MEGA 2560 hangs up. After that, when Arduino starts, the L led blinks twice and leds RX and TX remains always ON and laptop doesn't recognize the USB device. I have tried to put  the 16U2 chip in DFU mode to reflash it but it doesn't work. Some suggestion?

Thank you very much.

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