Solutions:First clean and heat usb connector if problem not solved then remove this and clean usb connector point with petrol or ctc(carbon tetra cleaner).This is solution one if Not Solved then try to repair with solution two.
Here is solution two witch is 10000000000000000000000% tested by me .
Try to make direct jumper on black hands free switcher risistanse witch is red circule marked on pcb
Try to make direct jumper on black hands free switcher risistanse witch is red circule marked on pcb
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