Fix: Windows 10 Activation Error 0xc03f6506

The error 0xc03f6506 appears when you are trying to upgrade Windows 10 Professional from your Windows 10 Home. To upgrade your system to Windows 10 Professional, you have to enter a valid license key that will upgrade your system to Windows 10 Pro after a restart. However, sometimes, Windows might not accept the license key you are trying to enter and put forth an error code like 0xc03f6506. This can be due to various reasons such as the key has already been used on another computer, your network connection etc.

Activation Error 0xc03f6506

You can easily circumvent the issue by implementing a few solutions given below. Also, it is important to note that the error code doesn’t mean that your key is lost as long as it is valid. You will just have to activate your Windows using ‘not so generic’ methods.

What causes the Windows 10 Activation Error 0xc03f6506?

The factors that cause this error code can vary, however, usually, they are due to the following reasons —

  • Used License Key: Well, according to Windows license terms, you are allowed to use a valid key on only one computer. Thus, if you already used the license key on another system, you won’t be able to use it on another unless removed from the other.
  • Windows Activation Servers: In some cases, the Windows Activation Servers are overloaded or not operating properly due to which you are not able to use the license key. In such a case, you can use alternate methods to use your key.

Now to get you back on the road, you can try the solutions given down below to isolate the issue.

Solution 1: Upgrade using the Command Prompt

If you are not able to use the license key to upgrade to Windows 10 Pro, you can try to do it using the Command Prompt. To do this, you will need a Windows bootable media. Once you have that, follow the steps given down below:

  1. Insert the Windows bootable media.
  2. Press Windows Key + X and select Command Prompt (Admin) from the list to open an elevated command prompt.
  3. Once the command prompt enters, type in the volume alphabet (for example E:) of the removable device to switch to it.
  4. Afterward, type in the following command and hit Enter:
    setup.exe /auto upgrade /pkey xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
    Upgrading Using Installation Media
  5. If your license key doesn’t work, try using the generic key (VK7JG-NPHTM-C97JM-9MPGT-3V66T) to upgrade to Windows 10 Pro.
  6. Once it upgrades to Windows 10 Pro, activate it using your key.

Solution 2: Using the Windows Registry

You can also try to tackle the issue by modifying a few entries in the Windows Registry. These modifications will help you to upgrade to Windows 10 Pro. We will change the entries of CurrentVersion and change the EditionID. Here’s how to do it:

  1. Press Windows Key + R to open up Run.
  2. Type in ‘regedit’ and then press Enter.
  3. Navigate to the following directory by pasting the path in the address bar:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
  4. On the right-hand side, locate EditionID and double-click it. Change the value to Windows 10 Professional.
    Changing EditionID Value
  5. Change the value of ProductName to Windows 10 Professional as well.
    Changing ProductName Value
  6. Afterward, navigate to the following directory:
    HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion
  7. Change the value of the same keys mentioned in step 5 and 6 there as well.
  8. Close Windows Registry.
  9. Press Windows Key + I to open Settings.
  10. Go to Update and security.
    Windows Settings
  11. Change the product key to the generic key VK7JG-NPHTM-C97JM-9MPGT-3V66T.
  12. It will upgrade to Windows 10 Professional after reboot.
  13. If the generic key doesn’t work, try entering your own valid key.

Solution 3: Disabling Network Adapter

Finally, you can also try to use the license key by disabling your network adapter. In some cases, using license keys while disconnected from the internet can isolate many issues. Here’s how to do it:

  1. Press Windows Key + I to open Settings.
  2. Go to Network & Internet and click ‘Change adapter options’.
    Network & Internet Settings
  3. Right-click on your network adapter and click Disable.
  4. Once disabled, try using the key again.
Kevin Arrows
Kevin is a dynamic and self-motivated information technology professional, with a Thorough knowledge of all facets pertaining to network infrastructure design, implementation and administration. Superior record of delivering simultaneous large-scale mission critical projects on time and under budget.
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Expert Tip

Fix: Windows 10 Activation Error 0xc03f6506

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