KB5121157

Microsoft has released cumulative update KB5121157 (Build 28020.2818) for Windows 11 version 26H1, intended for insiders on the Beta channel. The update includes a small set of general improvements and fixes designed to improve system performance. The changes are being rolled out to insiders gradually, so they will not appear for everyone at the same time.

• Print management. The updated print management interface has been temporarily removed from insider builds — Microsoft is refining it based on feedback. The previous print management tools remain in place and work as before. The company plans to bring back the new version of the interface in one of the future builds.
• File Explorer. The File Explorer home page remembers the state of sections — whether they are expanded or collapsed — and opens in the same state in which it was left.
• Magnifier. The Magnifier toolbar has received an updated design: icons are aligned with the Windows 11 style, and padding and spacing have been adjusted. The behavior of the tool has not changed — viewing modes, zoom control, keyboard shortcuts, and read aloud work as before.
• Personalization — Background. The stability of the Settings > Personalization > Background page has been improved. Support for DIB images as desktop wallpapers has been added. Desktop slideshow now works more reliably on newly created accounts. Thumbnail resolution when selecting a background in Personalization > Background has been improved. The display of wallpaper preview in Settings on portrait-oriented monitors has been fixed. The stability of wallpaper change processing has been improved when it happens several times in a row. Slideshow now works with multiple desktops: the system no longer switches the background back to a single image. A bug from the previous build has been fixed where wallpapers turned black for some insiders after every reboot.
• Windows Recovery Environment. The Windows Recovery Environment (WinRE) can now connect to Wi-Fi profiles saved in the system, including supported networks with certificate-based authentication. Previously, it could only connect on its own to a wired network without authorization or to a Wi-Fi access point pre-configured separately for WinRE, and for other WPA2 and WPA3 networks the password had to be entered manually. Now, if the recovery scenario requires internet, the environment will use the data from an already saved profile. This applies to quick machine recovery and cloud system rebuild: neither the user nor the administrator will need to pre-enter Wi-Fi credentials in WinRE.

To install update KB5121157, go to Settings > Windows Update and click Check for updates. A computer restart will be required to complete the installation.

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