Softwarewindows-11kb5127936cloud-rebuildwinrewindows-updatehibernatefile-explorer
Windows 11's October Preview Update Adds Cloud Rebuild, a Full Reinstall That Needs No USB Stick
KB5127936 brings Cloud Rebuild, which pulls a Windows image and your PC's drivers from Windows Update and reinstalls from the recovery environment, plus a customizable right-click menu and a hibernate change for laptops on low battery.
The update covers Windows 11 versions 25H2 and 26H2, builds 26200.9818 and 26300.9818. It’s a preview, which means you have to go get it: Settings > Windows Update > Advanced options > Optional updates.
Cloud Rebuild lives in Settings > System > Recovery as a Rebuild PC button. If Windows won’t start, the PC drops into the Windows Recovery Environment (WinRE) on its own after repeated boot failures, and Cloud Rebuild is on the Troubleshoot menu there. It gets online over Ethernet or Wi-Fi, asks Windows Update which build to install and fetches the networking drivers, then shows you the build, edition and language before you confirm.
You get two choices. “Remove files” is the fast one; Microsoft’s Cloud rebuild documentation warns that with it, “files might be recoverable using specialized recovery tools.” “Remove & sanitize files” asks the drive itself to securely erase everything first. Either way, “Cloud rebuild reformats the system disk and removes all locally stored files, accounts, apps, and settings.” When it’s done, you land on the same setup screens as a new PC.
IT admins can start one remotely through the Recovery CSP in a tool such as Intune, and pick either the installed build or a specific one.
Here’s how it lines up against the two ways you can already reinstall, Reset this PC and a USB stick:
| Cloud Rebuild | Reset this PC, cloud download | USB installation media | |
|---|---|---|---|
| Where Windows comes from | Image and drivers from Windows Update | “a fresh copy of Windows from the cloud” | A drive you build with the Media Creation Tool |
| Needs a second, working PC | No | No | Yes |
| Can keep your files | No | Yes, “Keep my files” | Yes, if Windows still starts and you run setup from it |
| Erase option | Drive’s own secure erase | “Clean data” | None beyond a clean install |
The rest of the update is quieter. The File Explorer right-click menu gets a Customize menu entry at the bottom: turn Windows commands like Send to on or off, add Print, decide which app extensions show, and put Cut, Copy, Paste, Rename, Delete and Share back as words instead of a row of icons. And the adaptive hibernate policy for Modern Standby laptops changes, with “less hibernation while the battery is above 80% and hibernating sooner when the battery is below 10%.”
Cloud Rebuild is the closest Windows has come to a Chromebook-style powerwash for a PC that won’t boot, and the fact that it fetches drivers from Windows Update is what makes that work. Most of us have reset a PC and then spent an hour hunting for the Wi-Fi driver. But Microsoft’s pages never say how big the download is or how long a rebuild takes on a slow connection. For a feature whose whole pitch is “no USB stick,” what happens on hotel Wi-Fi is the part I’d want to know first. How long would you wait on a progress bar before going back to the USB stick?