Microsoft has just released the May firmware and driver package for the new Surface 3 tablet running Windows 8.1. The new package includes the initial firmware that Microsoft shipped for the Surface 3, and the package includes all the necessary drivers for the Surface Cover, home button, graphics, Ethernet, wireless, camera, and several other programs.
Additionally, it includes installations for SAM 1.0.33500.0, Touch 22.214.171.124, and UEFI version 1.50410.78.0.
Note: When you click the Download button in the Microsoft Download Center, be sure to choose: Surface3_150504.zip either Surface3_150504.msi to download the correct package.
Users can manually download and install all the necessary drivers for Surface 3 (source link) or they can be obtained through Windows Update.
Source Microsoft via SoftPedia