how to install Windows, Ubuntu, or OSX OS on Surface device from bootable USB drive

1. First, reboot the Surface Pro
2. Then, insert the USB drive which available with Windows or Ubuntu or OSX installer that wish to boot from into the USB port on Surface device.

1. Press and hold the volume-down button. In the same time press and release the power button while holding volume-down button.
   Note: For Surface Pro 1 and Surface Pro 2 – keep holding volume-down until the Surface logo appears
2. Once done with correctly, the Surface Pro will read from the USB drive and initiating OS installation.

Note: Remember to disable Secure Boot if you are attempting to install any OS other than Windows 8.1 64-bit or later on Surface Pro. Otherwise, Surface device will simply ignore the USB installation drive.