Windows 10 v21H2 for eT4L devices was released on April 8 for deployment via F12 build. The previous 20H2 option is no longer available. Does your school have any student devices still running Windows 10 v1909? It's important that you focus on rebuilding these first, as a priority. Microsoft ends support for v1909 on May 10. For any staff devices that still have v1909, we recommend waiting for the v21H2 in-place upgrade option. This will allow for these devices to be upgraded to v21H2 without the need for a rebuild and deletion of local files and installed applications. However, to avoid disruption to the upcoming NAPLAN online testing window, we've scheduled the release of the v21H2 in-place upgrade option to immediately follow NAPLAN testing. If your school requires assistance with upgrading this old operating system to v21H2, please log an online ticket via EDConnect.