Build 26220.8148 out to Beta Channel

Build 26220.8148 being available in Windows Update for the Beta Channel simply indicates that a new Windows Insider Preview build is live and can be downloaded by devices enrolled in the Beta Channel.

If issues occur with a specific Beta build (for example, failed installs, regressions, or channel mix‑ups), current guidance from similar Insider scenarios in the context is:

1. If an update repeatedly fails and rolls back, either:
   • Pause Insider updates and wait for the next build, or
   • Back up important files and perform a clean install of Windows using a stable build, then re‑enroll in the desired channel if needed.
2. If the device appears to be on the wrong channel (for example, Release Preview users suddenly seeing Beta builds), Microsoft may temporarily have a service‑side issue. In such cases, Release Preview is restored once the issue is fixed, and devices then see the correct builds again.
3. If a problematic Insider build is already downloading and the goal is to stop receiving Insider builds entirely, one approach used in a prior case was:
   • Remove the WindowsSelfHost registry key,
   • Restart the device,
   • Pause updates,
   • Clear C:\Windows\SoftwareDistribution\Download, and
   • Restart again so Windows Update offers only non‑Insider builds.

These actions can affect Insider enrollment and update behavior, so they should be taken only when intentionally leaving the Insider Program or recovering from a broken Insider state.

References:

• February 24, 2026—KB5077241 (OS Builds 26200.7922 and 26100.7922) Preview
• Add attachments to Microsoft Q&A
• My system has been on RP channel why is it downloading a Beta release? - Microsoft Q&A
• Release Preview channel seems to be missing - Microsoft Q&A
• Problem updating to the latest preview insider channel build - Microsoft Q&A
• Build 26220.7070, WinRE still does not work with USB keyboard and mouse - Microsoft Q&A
• How to install 25H2 enablement package? - Microsoft Q&A