1. Check your own win7 laptop. Is there any external connection? The external keyboard and mouse are all external devices. If you have any, you need to remove all the external devices.
2, take the battery of win7 laptop, then press the power button of the laptop, long press for about 3-5 seconds, so that you can put the win7 laptop battery empty, after completion, repeat.
3. Follow the previous steps to install the battery on the laptop again. After rebooting, you will find that the MAC address can be modified.
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