Windows 11 Cloud Rebuild lets you reinstall Windows and your drivers straight from Windows Update, with no USB drive and even if the PC won’t boot. Microsoft added it in the optional KB5127936 update, and it’s rolling out gradually.
Think of it as a factory reset that doesn’t need a healthy copy of Windows on your drive. Here’s how it works and what to do first.
Here are the facts that matter most:
- It ships in KB5127936, an optional preview update released October 29, 2026.
- It works on Windows 11 25H2 and 26H2.
- You need internet and a PC plugged into power.
- It is a full reinstall, so back up your files first.
- Rollout is gradual, so you may not see it yet.
Skim that list and you already know the deal. The rest of this post covers the details.
How Windows 11 Cloud Rebuild actually works
Cloud Rebuild downloads Windows and the matching drivers from Windows Update, then reinstalls them. It doesn’t depend on your current installation being intact, according to Windows Central.
Before it starts, you review the target build, edition and language. Then you choose whether to remove files, or remove them and securely erase the drive. Secure erase can’t be undone.
Windows 11 already had a Cloud Download option for resetting a PC. Cloud Rebuild goes further because it also covers PCs that no longer start properly.
Where to find the new rebuild option
You can start it from two places, depending on whether your PC still boots.
| Situation | Where to start it |
|---|---|
| Windows still starts | Settings > System > Recovery > Rebuild PC |
| Windows won’t start | WinRE: Troubleshoot > Recovery and uninstall > Cloud rebuild |
| IT admin, many PCs | Remotely through the Recovery CSP |
WinRE, the Windows Recovery Environment, opens by itself after repeated boot failures. That makes it the likely way most people will meet this feature.
Another change in the same update helps here. According to BleepingComputer, WinRE can now reuse saved Wi-Fi profiles, including certificate-based ones. So a stuck PC can get online without you typing credentials.
What to do before you rebuild your PC
A rebuild is a last resort, so prepare like it is one. Run through this short checklist first:
- Copy documents, photos and anything else you can’t replace to an external drive or cloud storage.
- Note your Microsoft account sign-in and any license keys for paid apps.
- Plug the PC into power and use a stable connection.
- Choose “remove files” unless you plan to sell or give away the PC.
The secure-erase option is slower, but it’s the right pick if the PC is leaving your hands.
After the rebuild, the same update adds a Restore Summary. BleepingComputer says it lists the Windows settings and Microsoft Store apps restored from a backup profile, so you can see what came back and what you need to reinstall by hand.
Also check the other deadline on the same update. Microsoft says the original 2011 Secure Boot certificates expire in late June 2027, and our guide to the Secure Boot certificate check shows how to confirm yours.
Cloud Rebuild vs the older ways to reinstall Windows
Here is how the options compare for a typical home user:
| Method | Needs USB? | Works if PC won’t boot? | Drivers included? |
|---|---|---|---|
| USB installer | Yes | Yes | Usually no, you add them later |
| Cloud Download reset | No | Only if Windows still starts | Depends on the device |
| Cloud Rebuild | No | Yes | Yes, from Windows Update |
The USB and Cloud Download rows are general descriptions, not Microsoft’s wording. The Cloud Rebuild row follows the reports above.
Why you might not see it yet
Microsoft is rolling the feature out in stages. Even after you install KB5127936, the option may not appear right away.
Open Settings > Windows Update, check for updates, and install the optional update. Turning on “Get the latest updates as soon as they’re available” may help, but it doesn’t guarantee access. Optional updates reach everyone at the next Patch Tuesday, so wait for that if you’re not in a hurry. If you’re already weighing the update, our post on Windows 11 adaptive hibernate covers another change in the same release.
Frequently Asked Questions
Does Windows 11 Cloud Rebuild delete my files?
Yes, it’s a full reinstall. You can remove files or securely erase the drive, so back up anything you want to keep first.
Do I need a USB drive to reinstall Windows 11?
No. Cloud Rebuild pulls Windows and drivers from Windows Update, so you only need an internet connection and power.
Can I use it if Windows 11 won’t start?
Yes. Open WinRE, which appears after repeated failed boots, and pick Troubleshoot > Recovery and uninstall > Cloud rebuild.
Which Windows 11 versions get it?
KB5127936 covers Windows 11 25H2 and 26H2. The feature is rolling out gradually, so it may not show up on every PC yet.
Cloud Rebuild is the kind of feature you hope to never use and are glad to have. Install the optional update once it’s stable for you, make a habit of backing up your files, and you’ve removed the biggest headache of a dead PC: hunting for a second computer and a spare USB stick. Just don’t treat it as a casual fix, because it wipes the drive.
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