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SWITCHING FROM DEV TO BETA CHANNEL ON WINDOW 11
The time period to switch back to Beta Channel is over. You'll have to stay in Dev Channel or clean install back to Windows 10. Microsoft was warning this would happen for over a week as Dev Channel was going back to development builds. Usually once you're in Dev Channel you can not switch down to the other channels. You can switch from Beta or Preview Release Channels to Dev Channel, but not Dev Channel back down to Preview Release or Beta Channels.
Dev and Beta channel switching is available for limited period of time from Microsoft. This may change anytime without prior notice.
Please refer this step-by-step guide to switch the channel:
https://www.kapilarya.com/how-to-switch-windows-insider-channel-in-windows-11
Additionally, you can refer this official documentation: https://docs.microsoft.com/en-us/windows-insider/flighting#switching-from-the-dev-channel
Hope this helps!
Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.