To rearm Windows for activation, run slmgr /rearm in an admin Command Prompt and restart; this resets the activation grace period, typically granting another 30 days, but works only a limited number of times (usually 3 to 6 rearms depending on edition), after which it will no longer function, so it should be used judiciously during setup or troubleshooting before entering a valid product key or contacting Microsoft support.

If you're trying to rearm Windows for activation, it usually means you're resetting the Windows activation grace period—commonly done in scenarios like setting up a new system, troubleshooting activation issues, or extending evaluation periods (e.g., for Windows 10/11 Enterprise trials or unactivated systems).

Note: Rearming only works a limited number of times (typically up to 3 or 6 times, depending on edition), and it's not a permanent fix. It simply resets the clock so you can continue using Windows while you resolve activation.

? How to Rearm Windows (Using slmgr /rearm)

This method uses the Software Licensing Management Tool (slmgr.vbs) via Command Prompt with admin rights.

1. Open Command Prompt as Administrator

• Press Win S, type cmd.
• Right-click on Command Prompt and select Run as administrator.
• Click Yes if prompted by User Account Control (UAC).

2. Run the Rearm Command

Type the following command and press Enter:

slmgr /rearm

?? Alternative syntax (same result):

cscript slmgr.vbs /rearm

3. Restart Your Computer

After the command runs successfully, you’ll see a message prompting you to restart your computer. Do so to complete the rearm process.

Upon reboot, the activation countdown will be reset (usually giving another 30 days, depending on edition).

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?? Important Notes

• Limited rearm count: Most Windows editions allow only 3 to 6 rearms total. Once exhausted, slmgr /rearm will no longer work.
• Not all editions support rearming: Consumer versions (like Home or Pro) may have limited or no rearm capability after initial setup.
• Evaluation versions (e.g., Windows 10/11 Enterprise LTSC): These are designed to be rearmed and may allow more resets.
• You cannot rearm indefinitely: This is not a workaround for long-term unlicensed use.

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? Other Useful slmgr Commands (For Troubleshooting)

While dealing with activation, these commands may help:

• slmgr /dli – Display license information
• slmgr /dlv – Show detailed license status (including rearm count)
• slmgr /ipk <product_key></product_key> – Install a new product key
• slmgr /ato – Activate Windows immediately

Use slmgr /dlv to check how many rearms are left.

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? If slmgr /rearm Fails

Common reasons:

• You’ve already used all allowed rearms.
• The system is already activated.
• You're using a retail or OEM non-evaluation edition with no grace period left.
• Group Policy restrictions (common in enterprise environments).

? Tip: If rearm is blocked, you might try resetting the licensing status using registry edits or system image tools—but this is advanced and not recommended unless you know what you're doing.

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Final Thoughts

Rearming Windows is a built-in feature primarily intended for system administrators deploying images or users troubleshooting activation during setup. It’s not meant to bypass licensing permanently.

Once you rearm, make sure to:

• Enter a valid product key (slmgr /ipk XXXXX-XXXXX-...)
• Connect to the internet for online activation
• Or contact Microsoft support if activation fails

Basically, /rearm gives you a second chance—not infinite chances.

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? Bottom line:
Run slmgr /rearm in an admin Command Prompt, then restart. Works only a few times—use it wisely.

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