A Surface Pro 3 Firmware update has been released “System Firmware Update – 3/26/2015” and it contains a few new features.
Improved Boot Process
- You can now boot to a USB and PXE without having to hold down the volume key at start up
- You can now disable ports on the Surface, such as the Cameras, USB ports and Wi-Fi
- There is now an interface to allow UEFI settings to be configured remotely
You can find more details at http://blogs.technet.com/b/surface/archive/2015/03/26/improvements-to-your-surface-pro-3-devices.aspx and you can download from http://www.microsoft.com/en-us/download/details.aspx?id=38826