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4-3 Use External Power Supplier
Please follow the steps as below.
Step1. Remove the jumper, J10 and clear solder on R19.
Step2. Connect host PC by USB cable.
Step3. J7 is power input, and voltage range is from 3.3V to 4.3V.
Step4. J9 is GND.
Figure. J7, J9, J10 & J19
