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You might want to ask them first. I mean that in the flashing software their should be a setting for this. But if do it wrong it might brick the device. As you have the firmware on it now try going into just the devices recovery menu and factory reset from there. I think normally you just boot with the pin held in without a usb cable. It should go to recovery and you pick options with the pin and hit power to accept them. If you have physical volume buttons then it might be those then power to confirm.
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