Ken xin da watchphone sc6531 detection problem

if i set pins manually and set pinout, detection ok.

Setting pinouts...

Find USB device:SCI USB2Serial (COM26), (VID_1782&PID_4D00)

>>Pinout setting complete.



but i want to read flash, tick auto detect n start pinout can not be detected?



Detection initiated...

Vcc: null

Gnd: 5

Analyzing D+ and D-...

Failed to detect.



What could be the problem?

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