Windows 11 Insider preview build 22478 rolls out to the Windows Insiders in the Dev Channel. The new Fluent-designed emoji first appears in Windows 11. Of course, there are some other changes, improvements, and fixes. Now, you can learn information from this MiniTool post.

Windows 11 Insider Preview Build 22478 Rolls out to Insiders in the Dev Channel

On October 14, 2021, Microsoft released Windows 11 Insider Preview build 22478 to Insiders in the Dev Channel. On the occasion of the 7th anniversary of the Windows Insider Program, Microsoft releases two special desktop wallpapers to Insiders.

Download the Wallpaper of dark theme

Download the Wallpaper of light theme

Besides, Microsoft began to test Update Stack Packages, which is designed to deliver update improvements outside of the major OS (operating system) updates like new builds.

The previous Dev Channel Windows 11 builds from the RS_PRERELEASE branch will expire on 10/31/2021. You’d better update your Windows 11 to this build in time.

Now, let’s see the new, changes, improvements, and fixes in this new Windows 11 preview build.

New, Changes, Improvements, and Fixes in Windows 11 Insider Preview Build 22478

New Fluent Emoji Added

Early in July this year, Microsoft announced refreshed and new Fluent-designed emoji. Microsoft first shows the new emoji design to Windows Insiders in the Dev Channel in this Windows 11 build 22478.

Changes and Improvements

  • The updated version of the Korean IME is available to all users in the Dev Channel.
  • When your laptop is closed, you can use your Facial Recognition (Windows Hello) on your connected monitor to login to your device if it has a supported camera attached.
  • Change the underlying indexer platform to improve overall reliability and database size. This can reduce disk space usage in the system especially when users have very large Outlook mailboxes.
  • You can adjust the volume level by scrolling the mouse wheel on the volume icon in the taskbar.
  • When you add a new language in Settings, the dialog is more modern with round corners.


Microsoft fixed many issues in this latest Windows 11 Insider preview build, including the issues that happen to the Start menu, taskbar, File Explorer, Widgets, Search, etc.

Click here to learn all the fixes and known issues to be solved.

How to Get Windows 11 Insider Preview Build 22478?

Update to the Latest Windows 11 Preview Build

Step 1: Click Start.

Step 2: Go to Settings > Windows Update to check whether Windows 11 Insider Preview 22478.1000 (re_prerelease) is available.

Step 3: Click the Download now button to start the downloading and installing process. It is a quick process to complete the Windows 11 preview build from the RS_PRERELEASE branch. Your computer will restart several times during the process. The whole process may even last for an hour. Please be patient.

update to Windows 11 build 22478

Upgrade Windows 10 to Windows 11 Build 22478

If you are currently running Windows 10 and want to experience Windows 11 Insider preview build 22478, you need to first participate in the Dev Channel of the Windows Insider Program and then upgrade to this Windows 11 build.

Step 1: Join the Windows Insider Program

Step 2: Go to Start > Settings > Update & security > Windows Update to check whether you receive the Windows 11 build 22478. If yes, the downloading process should start automatically. You should wait until the whole process ends.

Step 3: When the installing process ends, you need to restart your computer to complete the Windows 11 upgrade process.

MiniTool Software You Should Try on Windows 11

Here is some MiniTool Software you should try on your Windows 11 computer:

If you want to back up your Windows data, you can use MiniTool ShadowMaker, a powerful Windows data backup software.

Free Download

If you need to rescue your lost and deleted files on Windows 11, you can try MiniTool Power Data Recovery, a free file recovery tool.

Free Download

If you are looking for a dedicated partition manager, MiniTool Partition Wizard is worth trying.

Free Download

Should you have other related issues, you can let us know in the comments.

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