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This will depend but almost guarantee requiring the devices to be rooted in order to manipulate the hardware. The only caveat emptor is, this needs root and busybox installed, and that the wifi is active: Plug the usb cable to the device, and invoke this, adb shell. Switch to superuser, i.e. su Invoke this - busybox ifconfig wlan0 down to bring down the ...

You didn't name your device -- but most likely got some China import. There were some readings a little time ago about this issue. Normally, a MAC address should be unique to the device -- the producer probably wanted to save some license costs... Nevertheless, that background isn't going to help you much. There are some apps available on the Playstore ...