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Hi Poumpi,
USB input defective? The fastest solution, and often the most effective, is to make sure the USB port of your device is clean or not there are any manufacturing defects. Often the smartphone does not load because there is contact between the charger and the phone, or this contact is not stable.
You will not have to do is turn off the device, remove the battery and so very gentle with something very small, such as a toothpick, move the lever that you find into the USB port. I recommend you be careful! Reinsert the battery, turn on the device and try to load it. Nine times out of ten this procedure will work.
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