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i got iphone 6 which is having bootloop problem , as usual i tried to restore but it is not detecting by itunes , after visual inspection i found someone has worked on tristar , i change tristar with new one still it is not detecting by pc ,tried with another frame , new lcd , good known battery, still same issue ,please help with this

Check all the pads below the trister is not a complete for USB there is also a other parts from USB connector to trister . Check all pads properly