If running this build inside a nested virtual machine, hardware virtualization settings may need to be toggled off and back on via the host's PowerShell console to prevent green screens of death (GSOD).
For technicians, archival hobbyists, and enterprise testing labs, deploying this specific version via a bootable ISO requires an understanding of what this software offers, where its visual design is heading, and its strict system limitations. Key Visual and Architecture Features of Build 21390
Historically, registered Insiders could visit the Windows Insider Preview Downloads page to get official ISOs. However, as of 2025, the Windows 10 builds have been removed from this page in favor of Windows 11 builds. You will no longer find 21390 there directly. Windows 10 Insider Preview Build 21390 -x86 X64- ISO Incl
Build 21390 was essentially the before the world saw the first leaked build of Windows 11 (Build 21996) and the subsequent official reveal. It remains a favorite for enthusiasts who enjoy the stability of Windows 10 but with the first hints of the Windows 11 aesthetic, such as the Segoe UI Variable font and early desktop icon previews.
As part of the design language overhaul, Microsoft updated the visual aesthetics of core utilities: If running this build inside a nested virtual
Are you trying to , or are you just interested in the history of Windows UI ?
When Microsoft dropped Build 21390 on May 26, 2021, it was publicly branded as a Windows 10 Dev Channel flight. Behind the scenes, however, Microsoft was preparing to unveil Windows 11. However, as of 2025, the Windows 10 builds
Microsoft reintroduced and refined the candidate window design for the Japanese and Chinese IMEs.
Users could set Windows Terminal (version 1.9 or higher) as the default emulator for Command Prompt and PowerShell.