Not every Android phone or tablet will be able to crack a WPS PIN. The device must have a Broadcom bcm4329 or bcm4330 wireless chipset and must be rooted. The Cyanogen ROM will provide the best chance of success. Some of the known supported devices include:

This tool enables Monitor Mode on your Broadcom chipset, which is essential for being able to crack the PIN. The bcmon APK file is available for free from the bcmon page on the Google Code website.

After installing the APK file, run the app. If prompted, install the firmware and tools. Tap the “Enable Monitor Mode” option. If the app crashes, open it and try again. If it fails for the third time, your device is most likely not supported.

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Tap “Run bcmon terminal”. This will launch a terminal similar to most Linux terminals.Type airodump-ng and tap the Enter button. AIrdump will load, and you will be taken to the command prompt again. Type airodump-ng wlan0 and tap the Enter button.