: It includes back-end optimizations for the "News and Interests" taskbar widget, reducing CPU usage and refining text scaling for high-DPI monitors.
Microsoft noted, "This update does not include anything new and is designed to test our servicing pipeline". The most relevant version for users seeking the "final" stable preview is usually 21390.2025.
When downloading operating system installation media, the terminology used determines compatibility and convenience:
Because of its status as a "hybrid" transition OS, tech enthusiasts, archive collectors, and developers frequently search for the package. This guide explores everything you need to know about Build 21390, its historical importance, its core feature upgrades, and how to safely navigate installing or archiving it today. 🏛️ Historical Context: The Last of its Kind Windows 10 Insider Preview Build 21390 -x86 X64- ISO Incl
Use a utility like to burn the ISO onto a USB flash drive.
As a compilation build (ISO inclusive), stability was a primary focus:
Some systems may experience an issue where the installation errors out at 91% and rolls back. This is often caused by conflicting storage controllers. Disconnecting non-essential secondary hard drives before setup usually fixes this. : It includes back-end optimizations for the "News
Boot from the USB drive and select your language, time format, and keyboard preferences. Click .
If you’ve been following the Windows Insider journey for the last few years, you know that Build 21390 holds a special—and slightly bittersweet—place in history. Released in late May 2021, this was one of the very last builds of Windows 10 before Microsoft officially pivoted to announcing Windows 11.
Resolved an issue where news text on the taskbar appeared blurry or misaligned. As a compilation build (ISO inclusive), stability was
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).
Perhaps the most functional update in Build 21390 was the ability to set as the default terminal emulator on Windows. This required Windows Terminal Preview version 1.9 or higher and allowed developers and command-line users to bypass the legacy Console Host by default.
On June 14, 2021, Microsoft began rolling out a cumulative update that brought the build number to . This update contained no new features; instead, it was designed to test Microsoft’s servicing pipeline. Users who have installed the cumulative update will see the newer .2025 version number, while the base ISO typically contains the original .1 release.
The "News and Interests" taskbar widget received stability patches in this release. The hover behavior was tuned to prevent accidental openings, and text rendering on high-DPI displays was sharpened. 3. Windows Subsystem for Linux (WSL) Enhancements