Can't activate Windows after BIOS firmware upgrade and installing Windows 11

Question

Can't activate Windows after BIOS firmware upgrade and installing Windows 11

Barak Ori 0

Short version: my computer crashed, during the long process of trying to recover it I upgraded the firmware on the BIOS and NVMe, now Windows 11 won't let me activate (before the crash I had Windows 10 installed). All attempts to reach a human to try and resolve this failed, it's all automated systems that fail.

More details: my system crashed and when I tried reinstalling, installation failed with BSOD, or sometimes succeeded and then Windows Update crashed with BSOD. This led to a long process of attmpts to diagnose the problem, including the above firmware upgrade, pulling out half of the memory, switching to an old HD and changing various memory settings.

Eventually, after disabling some memory options in the BIOS I was able to install Windows 11 on my original SSD, added back the 16GB of memory I removed etc. but now my hardware is not recognized.

In https://account.microsoft.com/devices I see my new installing but also another device that looks like my old installation (Windows 10, 32GB memory, the right OS edition), but no automated way lets me pull the license and activate my Windows 11. Worse - whatever I do, I can't get to a point where I can speak to a human on the phone or chat. Please help.

Neil D 34,740 Reputation points Volunteer Moderator

2026-10-27T08:56:11.28+00:00

Was it an original Windows 10 licence previously or part of the free upgrade from Windows 7/8?

The devices shown on your account under devices are the installation details but not whether there is a valid licence or not. That info is stored elsewhere.

So did you buy the Windows 10 licence as a Windows 10 licence from Microsoft or a 3rd party. Did you get a product key as part of the purchase.

Open a command prompt and enter slmgr /dlv [press return] and post a screenshot of the result.

Barak Ori 0

Thanks Neil,

I honestly don't remember. I think it was bought as Windows 10. The computer is 8 years old, so it was likely bought with Windows 10.

Just to reiterate, I did not change the motherboard / memory or boot disk. I did disconnect a second disk (that failed) and update the firmware on the motherboard and the NVMe boot disk.

Here's the details from slmgr / dlv

---------------------------
Windows Script Host
---------------------------
Software licensing service version: 10.0.26100.9711
Name: Windows(R), Core edition
Description: Windows(R) Operating System, RETAIL channel
Activation ID: 2b1f36bb-c1cd-4306-bf5c-a0367c2d97d8
Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f
Extended PID: 03612-03261-000-000000-00-1033-26200.0000-2722026
Product Key Channel: Retail
Installation ID: 565954460505268005353755311386426066310432778542534222755803283
Use License URL: https://activation-v2.sls.microsoft.com/SLActivateProduct/SLActivateProduct.asmx?configextension=Retail
Validation URL: https://validation-v2.sls.microsoft.com/SLWGA/slwga.asmx
Partial Product Key: 8HVX7
License Status: Notification
Notification Reason: 0xC004F034.
Remaining Windows rearm count: 1001
Remaining SKU rearm count: 1001
Trusted time: 10/30/2026 8:47:06 PM
---------------------------
OK   
---------------------------

Thanks again.

Neil D 34,740 Reputation points Volunteer Moderator

2026-10-30T20:00:15.2033333+00:00

@Barak Ori the details are for a retail generic licence for Home edition. (that cannot be used to activate windows)

That would show if a licence was previously based on the free upgrade from Windows 7/8 to Windows 10. It is no longer valid for Windows 11. Microsoft closed a loophole in 2023 that continued to allow those licences to activate Windows 11.

You can try ShowKeyPlus from the Windows Store to see if that gives any more licence key detail or shows previous details in the Upgrades option in the left pane. (although it may not if you have clean installed at any time)

What does that app show about the current licence.?
Barak Ori 0 Reputation points

2026-11-01T21:38:38.9766667+00:00

I thought the loophole was allowing to install old Win7/8 upgrades on a different computer. This is the same computer - same hardware.

Anyway, that's what ShowKeyPlus shows me.

Thanks again.
Neil D 34,740 Reputation points Volunteer Moderator

2026-11-01T22:44:50.5066667+00:00

There is no valid licence in your screenshot.

Yes the loophole was for Windows 10 but it has also affected Windows 11. The original free upgrade was for Windows 10 only and not Windows 11.

What seems to happen is if there is a change (and a bios update will trigger it) windows flags the activation server to check the licence. If that doesn't meet the new rules applied in 2023 the the licence is rejected and activation fails.

ShowKeyPlus doesn't show any valid licence only the generic key.

It looks like you will need a new licence to activate Windows 11.

You can check with Microsoft support directly to see if they have any other tools to use via a remote session.

Use the Get Help app in windows and search the phrase billing then select Contact Support at the bottom of the window. Select two filters and you should see Chat with a support agent in your web browser as a link to select.

1 answer

Your answer

Neil D 34,740 Reputation points Volunteer Moderator

2026-10-27T08:56:11.28+00:00

Was it an original Windows 10 licence previously or part of the free upgrade from Windows 7/8?

The devices shown on your account under devices are the installation details but not whether there is a valid licence or not. That info is stored elsewhere.

So did you buy the Windows 10 licence as a Windows 10 licence from Microsoft or a 3rd party. Did you get a product key as part of the purchase.

Open a command prompt and enter slmgr /dlv [press return] and post a screenshot of the result.
Barak Ori 0 Reputation points

2026-10-30T18:56:32.31+00:00

Thanks Neil,

I honestly don't remember. I think it was bought as Windows 10. The computer is 8 years old, so it was likely bought with Windows 10.

Just to reiterate, I did not change the motherboard / memory or boot disk. I did disconnect a second disk (that failed) and update the firmware on the motherboard and the NVMe boot disk.

Here's the details from slmgr / dlv

--------------------------- Windows Script Host --------------------------- Software licensing service version: 10.0.26100.9711 Name: Windows(R), Core edition Description: Windows(R) Operating System, RETAIL channel Activation ID: 2b1f36bb-c1cd-4306-bf5c-a0367c2d97d8 Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f Extended PID: 03612-03261-000-000000-00-1033-26200.0000-2722026 Product Key Channel: Retail Installation ID: 565954460505268005353755311386426066310432778542534222755803283 Use License URL: https://activation-v2.sls.microsoft.com/SLActivateProduct/SLActivateProduct.asmx?configextension=Retail Validation URL: https://validation-v2.sls.microsoft.com/SLWGA/slwga.asmx Partial Product Key: 8HVX7 License Status: Notification Notification Reason: 0xC004F034. Remaining Windows rearm count: 1001 Remaining SKU rearm count: 1001 Trusted time: 10/30/2026 8:47:06 PM --------------------------- OK ---------------------------

Thanks again.
Neil D 34,740 Reputation points Volunteer Moderator

2026-10-30T20:00:15.2033333+00:00

@Barak Ori the details are for a retail generic licence for Home edition. (that cannot be used to activate windows)

That would show if a licence was previously based on the free upgrade from Windows 7/8 to Windows 10. It is no longer valid for Windows 11. Microsoft closed a loophole in 2023 that continued to allow those licences to activate Windows 11.

You can try ShowKeyPlus from the Windows Store to see if that gives any more licence key detail or shows previous details in the Upgrades option in the left pane. (although it may not if you have clean installed at any time)

What does that app show about the current licence.?
Barak Ori 0 Reputation points

2026-11-01T21:38:38.9766667+00:00

I thought the loophole was allowing to install old Win7/8 upgrades on a different computer. This is the same computer - same hardware.

Anyway, that's what ShowKeyPlus shows me.

Thanks again.
Neil D 34,740 Reputation points Volunteer Moderator

2026-11-01T22:44:50.5066667+00:00

There is no valid licence in your screenshot.

Yes the loophole was for Windows 10 but it has also affected Windows 11. The original free upgrade was for Windows 10 only and not Windows 11.

What seems to happen is if there is a change (and a bios update will trigger it) windows flags the activation server to check the licence. If that doesn't meet the new rules applied in 2023 the the licence is rejected and activation fails.

ShowKeyPlus doesn't show any valid licence only the generic key.

It looks like you will need a new licence to activate Windows 11.

You can check with Microsoft support directly to see if they have any other tools to use via a remote session.

Use the Get Help app in windows and search the phrase billing then select Contact Support at the bottom of the window. Select two filters and you should see Chat with a support agent in your web browser as a link to select.

Answer 1

A BIOS or other significant firmware/hardware change can cause Windows activation to stop working because the license is associated with device hardware. That matches errors such as 0xC004F211 and 0xC004F213.

Recommended path:

Confirm the device is fully on Windows 11.
- Press Start, type winver, and verify the version/build.
Run the Windows Activation troubleshooter first.
- Go to Start > Settings > System > Activation > Troubleshoot.
- If available, select I changed hardware on this device recently.
- Sign in with the same Microsoft account that was linked to the digital license.
- In the device list, select This is the device I’m using right now, then select Activate.
If the current PC does not appear in the troubleshooter device list, make sure the sign-in account is the same Microsoft account previously associated with the Windows digital license. The troubleshooter only works with that connected Microsoft account.
If a valid product key was previously used on this PC, try entering it manually:
- Go to Start > Settings > System > Activation > Change product key.
- Enter the 25-character key.
If Windows was repaired or rebuilt and a different edition was installed, activation can fail.
- If the troubleshooter detects a valid digital license for a different edition, it will provide instructions to install the correct edition.
If the motherboard was effectively treated as changed and Windows originally came preinstalled on the device, a new license may be required.
- In that case, go to Start > Settings > System > Activation and select Go to Microsoft Store.
If the troubleshooter or activation attempt changes the error code, use the new code as the basis for the next step. Microsoft’s guidance is to check the updated error because it can change after troubleshooting.

Relevant error guidance from Microsoft:

0xC004F211 / 0xC004F213: Windows detected a hardware change or no product key was found. Use Troubleshoot, try the hardware-change reactivation path, or enter the previous product key.
0x800704CF: No valid Windows license was found. Enter a valid product key in Activation settings.
0xC004F212: The installed Windows edition does not match the license.

If the automated troubleshooter cannot find a linked device or cannot complete reactivation, Microsoft’s documented next step for unlisted activation errors is to contact customer support.

References: