System update for Surface Pro 4 May 24 release
Surface Pro 4 update history
Updates are installed automatically on Surface through Windows Update. Here’s a summary of what’s been included in each update so far.
Surface Pro 4.
Microsoft Releases Major Firmware Update for Surface Book, Surface Pro 4
April firmware updates available for the latest Surface
Source: Microsoft Surface Pro 4 update history | Surface firmware updates
Source: Microsoft Surface Book update history | Surface firmware updates