First press the win key R key to enter run, enter cmd and press Enter.
In the dialog box, first enter your iTunes software installation path (right-click the desktop iTunes icon and properties to directly copy the path)
Then copy -setPrefInt carrier-testing 1
This parameter goes to the end of the path just copied (what should be noted here is -setPrefInt carrier-testing 1. Add a space in front of this parameter)
Then press Enter and the computer will automatically open the iTunes software.
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Step 2: Connect the phone to the computer and open the iTunes software.
Then: click shift update at the same time.
In the file extension on the lower right side of the dialog box, select the iphone/ipad operator configuration file ipcc and then select the operator file you downloaded to flash it.
Select the corresponding IPCC file to flash. Note: To flash IPCC, you must have a higher version and a lower version, otherwise you cannot flash.
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