AtlasOS

Reverting Atlas

Important information for reverting back to Windows 11.

Before Uninstalling

We are sorry to hear that you are not satisfied with AtlasOS. If you are not using the latest playbook, please consider upgrading. This may address certain issues found in older playbooks.

Please also use our support channels

Discord Community

Connect with the community and get support

GitHub Discussions

Get support from the community and find answers to common issues

Still having problems?

We are sorry to see you go. Please know that we are constantly improving AtlasOS to ensure issues are resolved for future releases.

Before you continue, please consider reporting your issue so we can address it in a future release. Alternatively, provide us feedback through Discord and GitHub Discussions.

Tip

Looking to reinstall/install Atlas? Follow the installation guide instead.

Prerequisites

Before proceeding, ensure you have:

  • Backed up all important data to a safe location:
    • Cloud storage (Google Drive, Microsoft OneDrive, Dropbox)
    • External storage (NAS, portable drive, USB drive)

Step 1: Download Windows ISO

  1. Visit Microsoft’s Windows 11 download page
  2. Choose the appropriate ISO:
    • For Intel/AMD CPUs: Click Download Windows 11 Disk Image (ISO) for x64 devices
    • For ARM CPUs: Click Download Windows 11 Disk Image (ISO) for ARM64 devices
  3. Select Windows 11 (multi-edition ISO) Confirm
  4. Choose your language Confirm
  5. Click the appropriate download option:
    • 64-bit Download for x64 systems
    • ARM64 Download for ARM systems

Tip

Which version? Intel/AMD CPUs use x64. ARM (Snapdragon) systems use ARM64. Make sure you download the correct ISO for your CPU architecture.

You may lose internet connection after Windows installation if network drivers aren’t available.

Download now:

  1. Search for your motherboard or device model + “network drivers”
  2. Download the latest drivers
  3. Save to a USB drive or external storage

Info

Can’t find drivers? Check your manufacturer’s support page or search Device Manager for your network adapter name.

Step 3: Reinstall Windows

Choose your installation method below.

Best for: Users already running Windows who want the easiest installation method.

  1. Disconnect internet (unplug ethernet, disable Wi-Fi)

  2. Mount the ISO:

    • Right-click downloaded ISO Open With File Explorer
    • Note the drive letter (e.g., H: )

  3. Launch Windows Setup:

    • Press Win + R
    • Type: H:\sources\setup.exe (replace H with your drive letter)
    • Press Enter Accept UAC prompt

  4. Complete Windows Setup:

    • Click No thanks (updates)
    • Uncheck “I want to help make Windows installation better”
    • Click I don’t have a product key
    • Select Windows Pro (or Pro for Workstations/Enterprise)
    • Accept license Custom: Install Windows only (advanced)
    • Select your Windows drive Next OK (Windows.old warning)
    • Wait for installation (~15-20 minutes)

BitLocker Error?

See troubleshooting to suspend BitLocker first.

Step 4: Continue with the Windows setup

You should now be at the regular Windows initial setup and back on stock Windows.

Step 4.1: Removing the Old Windows folder

If you previously followed steps that mentioned a Windows.Old folder, you can find your previous installation data in this folder.

When you are sure you have retrieved any important data from this folder, follow these steps.

  1. Open Windows Settings System Storage
  2. Click Temporary files, and wait for it to scan your files.
  3. Select Previous versions of Windows, and then click Remove files.