Windows 11 Keeps Asking for A1B2C3, 4 Best Fixes to Solve

The Windows 10/11 login screen repeatedly prompts to enter A1B2C3? Can't log in even if the PIN code is correct? This article will provide several solutions to help you get rid of your troubles.

Continuous prompt for input A1B2C3

When the computer boots to the login screen, you need to enter the PIN code to log in to the operating system. However, sometimes Windows 10/11 will repeatedly prompt for the A1B2C3 security code. An error message will be displayed on the screen:

"PIN code is entered incorrectly many times."

"Please enter A1B2C3 below to try again."

This problem may occur even if the PIN you entered is correct. This security code is a security measure taken by the system to prevent brute-force attacks. If someone tries to log in to your account remotely, you need to enter this security code.

So, how to remove the Windows A1B2C3 security code prompt and successfully log into the system? Let's explore some possible solutions together.

Method 1: Enter the security code or use other login options

If the Windows 10/11 login screen continues to prompt for A1B2C3, you can enter A1B2C3 first, and then enter PIN code/biometric information. Alternatively, click the login option and select other Windows login methods, such as the password you set earlier.

Method 2: Delete Ngc folder

Windows stores your login information in the Ngc folder. For some reason, this folder may be error-free or corrupted, resulting in a login error. If Windows keeps prompting for A1B2C3, try deleting the Ngc folder:

Step 1: Press Win E to open File Explorer.

Step 2: In Windows 11, click View > Show > Hide Items to show the AppData folder. Then, access this path: C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft .

Step 3: Right-click on the Ngc folder and select Properties .

Step 4: Under the Security tab, click Advanced .

Step 5: Click Change , enter administrator in the text field, and then click Check Name > OK . Click Apply > OK to save changes.

Step 6: Select the Ngc folder and click Delete .

Method 3: Reset the access control list

Normally, if the access control list (ACL) in the Ngc folder is corrupted, Windows 11 will continue to prompt for the A1B2C3 security code. To resolve this issue, you can reset the ACL:

Step 1: Open the command prompt as administrator.

Step 2: Copy and paste icacls C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\Ngc /T /Q /C /RESET into the CMD window and press Enter .

Step 3: After reset, you can add a new PIN code.

Method 4: Create a new PIN code

There may be problems with your old PIN code, and the login data may have been deleted, causing the A1B2C3 security code prompt to continue to appear. You can try to create a new PIN code to solve the problem:

Step 1: Press Win I key to open the Settings app.

Step 2: Navigate to Account > Login Options .

Step 3: Expand PIN (Windows Hello) , click Change PIN , enter the old PIN code, and then enter the new PIN code.

Step 4: Restart the computer and log in to Windows using the new PIN code. Then, the problem of continuously prompting to enter A1B2C3 will disappear.

Summarize

How to remove the Windows A1B2C3 security code prompt? If the Windows 10/11 login screen continues to prompt for A1B2C3, please try the above solution to solve this problem easily.

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