Stuck on Slow ring, get to fast ring this way. If you’ve opted for Slow ring to get more stable Preview builds which already been delivered to Fast Ring users, sometimes, when you try to switch to fast from Slow, you couldn’t, you’ll be automatically set to Slow, Settings app shows that. Here is how to fix this and stay in the Fast ring forever until you change your mind.
Fix Couldn’t Change from Slow to fast ring in the Windows 10 Preview build
1. Press Win+X to open the Quick menu, select’ Command Prompt (Admin)’
2. Run the following command
reg flags HKLM\Software\Microsoft\WindowsSelfHost\Applicability set DONT_VIRTUALIZE