Windows Server 2016 build 14257 (rs1 release)

Windows Server 2016 build 14257 (rs1_release) is a build of Windows Server 2016. This build was previously only available as an  containing the Datacenter Core SKU, which was shared by gus33000 on 28 June 2020. A full version of this build with Desktop Experience was later uploaded to the BetaArchive FTP server on 4 February 2021.

Installing Datacenter Core SKU from a WIM file
Originally, this build was leaked as an x64 Datacenter Core SKU install.wim file. You must be sure to use the Hyper-V hypervisor for installation. On other hypervisors, the build will freeze at the boot screen after installation.

To install, use Windows Preinstallation Environment from Windows 8.1 RTM (x64).''

1. Partition and format the blank hard drive.

2. Use the DISM command to apply the WIM to the hard drive:

3. Add boot files:

4. Close Windows Preinstallation Environment and boot from your hard drive.

5. After installation, you will not be able to login as administrator, you need to use a password removal tool such as PCUnlocker Live CD to remove unknown password. Then you can set your log in password and login to the system safely as well.