Enhancements to how the OS handles command-line tools.
Before downloading and installing legacy Insider Previews, keep these technical limitations in mind: Windows 10 Insider Preview Build 21390 -x86 X64- ISO Incl
After releasing Build 21390.1, Microsoft used this build to test its update servicing pipeline. Throughout June 2021, Microsoft rolled out several Cumulative Updates on top of Build 21390, including: Enhancements to how the OS handles command-line tools
As part of Microsoft’s ongoing iconography overhaul, Build 21390 introduced new Fluent Design icons for the and MSI installers . While subtle, this represented Microsoft’s push to modernize even the deepest system utilities. and users with older hardware
: Users can now set Windows Terminal Preview (version 1.9 or higher) as the default terminal emulator , meaning command-line apps will automatically launch within it.
Select to perform a clean installation, format your target drive partition, and follow the on-screen prompts to complete setup. Important Considerations for Insider Builds
Windows 10 Insider Preview Build 21390 holds a unique place in Microsoft’s operating system history. Released in late May 2021, it was one of the final Windows 10 builds before Microsoft pivoted its development efforts toward Windows 11. For enthusiasts, collectors, and users with older hardware, this build represents the “last” true Windows 10 from the Dev Channel—complete with both and 64‑bit (x64) ISO images.