added OEM unlock check command

{% include alerts/warning_unlocking_bootloader.md %}

{% unless device.no_oem_unlock_switch %}

1. Enable OEM unlock in the Developer options under device Settings, if present.

{% endunless %}

1. Connect the device to your PC via USB.

1. On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window, and type:

    ```shell

    adb reboot bootloader

    ```

1. Once the device is in fastboot mode, verify your PC finds it by typing:

    ```shell

    fastboot devices

    ```

1. Now type the following command to unlock the bootloader:

    {% if device.custom_unlock_cmd %}

    fastboot oem unlock

    ```

    {% endif %}

1. Alternately on some devices to unlock the bootloader you may need to type the command:

    ```fastboot oem unlock-go    

    ```

1. Check if the device has been unlocked by typing the following command in command prompt (on Windows) or terminal (on Linux or macOS) window. The output will display a message similar to 'Device unlocked: true':

    ```fastboot oem device-info    

    ```

1. If the device doesn’t automatically reboot, reboot it. It should now be unlocked.

1. Since the device resets completely, you will need to re-enable USB debugging to continue.

{% if device.is_ab_device %}