Windows 11’s Cloud Rebuild can reinstall the OS on a PC that won’t boot, downloading Windows and its drivers from Windows Update. No USB stick is needed.
That means a dead PC no longer needs a second computer and a bootable USB stick to come back to life. According to Wccftech, it eliminates “bootable USB installation media or custom recovery images.” The drawback is a full wipe: there’s no option to keep your files, apps, accounts, or settings. Only data in cloud services such as OneDrive survives.
Wccftech says the feature arrived in KB5127936, the 28 October optional preview update for Windows 11 25H2 and 26H2. It’s rolling out gradually, but Microsoft’s own page still calls it “Cloud rebuild (Preview)” and says to “use it for evaluation on non-production devices only.” The same page says the Recovery CSP nodes are available only in Windows Insider Preview builds.
How it works
Cloud Rebuild lives in the Windows Recovery Environment (WinRE), which opens automatically after repeated boot failures. You can also reach it from Settings > System > Recovery > Advanced startup, then Troubleshoot > Cloud rebuild. A Rebuild PC option also sits under Settings > System > Recovery.
It connects over Ethernet automatically. On Wi-Fi, you pick a network and enter its passkey, and Microsoft’s troubleshooting notes say only WPA2-Personal networks work in WinRE. WinRE now also reuses eligible saved Wi-Fi profiles automatically.
From there, it contacts Windows Update, finds the target build, and downloads network drivers. You check the Windows build, edition, and language, then acknowledge a data-loss warning. The PC may restart several times, so Microsoft says to keep it plugged in. When it’s done, it boots into the first-time setup screens.
Windows 11 already had a cloud download option in Reset this PC. Cloud Rebuild fetches both the image and the drivers “without depending on the integrity of the installed operating system”, so a badly broken install doesn’t stop it.
Two ways to wipe
| Option | What it does |
|---|---|
| Remove files | Reformats the drive; faster, but “files might be recoverable using specialized recovery tools” |
| Remove & sanitize files | Asks the storage hardware to securely erase it; slower and irreversible; meant for recycling, returning, or reassigning a PC |
With more than one disk, you can wipe just the Windows disk or all of them, which takes much longer. Sanitising depends on the drive supporting it, and Microsoft says Windows can’t independently verify what the storage device did. Anyone with regulatory needs should check with the drive’s manufacturer. For wiping without reinstalling, a standalone DataSanitization.exe tool sits in the WinRE command prompt, but the PC won’t boot afterwards.
What it needs
It won’t rescue every PC. You’ll need a healthy WinRE (the reagentc /info command checks it), a compatible network driver from the manufacturer inside WinRE, and internet access. The hardware must also meet Windows 11’s minimum requirements. Error 0xc1900200 means it doesn’t, and the usual culprit is a disabled TPM. Error 0x800704C6 means there’s no network.
Businesses get extra control. IT admins can start and configure Cloud Rebuild remotely through the Recovery CSP in Intune, including picking the build. Autopilot and Intune devices then reconnect, apps and policies redeploy, and files return via OneDrive.
We first covered Cloud Rebuild in July. In February, the KB5077181 boot loop caused exactly the kind of mess it’s built for. Wccftech calls it welcome for badly corrupted installs, but suggests trying less drastic fixes first.
Don’t throw out that USB stick yet. Microsoft warns that interrupting a rebuild can leave Windows unable to boot, and then the way back is a recovery drive, installation media, or the manufacturer’s own media.
