Windows 11 adds cloud reinstall without a USB drive

Microsoft rolled out KB5127936 to the Windows 11 Release Preview channel for versions 25H2 and 26H2. Cloud Rebuild reinstalls the OS by downloading a fresh image and drivers from Microsoft servers, with no bootable USB required; the update also brings Dark Mode to Folder Options, a faster Explorer context menu and adaptive hibernation.

• Cloud Rebuild runs from Settings or WinRE and can wipe data before reinstalling
• File Explorer's Folder Options finally gets official Dark Mode support
• Adaptive hibernation kicks in above 80% battery and below 10%
• The build also cuts RAM usage and speeds up Edge launches