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Manually put the Phone/iPxd in DFU mode
Connect the MAC system computer and the DCSD tail plug interface with an IP data cable
Open the purple screen software and click to enter the purple screen
After the phone successfully enters the purple screen mode refresh the port and connect the device Read the bottom layer to perform the corresponding operation at the bottom of the hard disk
After the operation is completed, you can use the DCSD button to exit the purple screen