Why this method: It’s legal, clean (no malware), and gives you an untouched ISO.
Build 21390 belongs to the development branch. Unlike the "Sun Valley" updates that eventually morphed into Windows 11, Build 21390 focused on under-the-hood refinements.
Because Build 21390 was the bridge between two eras, x86 and x64 ISO images containing this specific build are highly sought after by operating system collectors, developers, and tech enthusiasts. It contains a fascinating blend of experimental features, modern Fluent design language, and the last remnants of classic Windows 10 architecture. Why Build 21390 is Logistically and Historically Crucial
Users in the Chinese community also reported an issue where the under this build. Some users also reported that USB audio jacks stopped working properly after upgrading to this build, with headphones connected to the audio jack still playing sound through the computer's speakers instead. Additionally, printer driver installation issues were reported for USB-connected printers. windows 10 insider preview build 21390 x86 x64 iso incl
Addressed an issue impacting Start Menu reliability in previous flights.
Note that while Build 21390 runs on x86 hardware, it is the . All subsequent builds require 64-bit processors.
Do you need help selecting a (like VirtualBox or VMware)? Are you setting up the 32-bit or 64-bit instance? Why this method: It’s legal, clean (no malware),
Resolving issues where some devices might experience a during log-in.
Once you have the Windows10_InsiderPreview_Client_x64_en-us_21390.iso (approx 4.8 GB), follow this guide.
Install as a secondary OS or in a Hyper-V/VMware virtual machine without time sync. Because Build 21390 was the bridge between two
At its release, this build focused on visual refinements and system performance: New Fluent Icons: Updated iconography for the Task Manager MSI installers Windows Terminal:
As with any Insider Preview build, there are known issues that Microsoft is working to resolve. Some of the known issues in Build 21390 include: