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Why can't the USB flash drive be communicated, can't display after inserting or display the previous program after a flash black?

Answer:

Check  that your computer data is successfully saved to flash memory disk

To change the USB flash disk and try to make formatting for it

ƒUSB extension cord is too long and the pressure is too high to load( standard distance is 5m).

 
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Scan the android version of the software download wifi card
    The LED control card and  GPRS wireless control card

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