July 23, 2024

In this article, we will discuss how to fix and disable the warning message “EFI USB Device Blocked by Current Security Policy” from a first-person perspective.

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Understanding the EFI USB Device Block Error

Error message on computer screen

The EFI USB Device Block Error occurs when the current security policy prevents the computer from booting from a USB device. To fix this issue, you can disable the warning and allow the USB device to boot.

Here’s how to fix and disable the warning:

1. Restart your computer and enter the UEFI or BIOS settings. This is typically done by pressing a specific key (e.g., F2, Del, Esc) during the startup process.

2. Look for the option that controls the boot order or boot priority. It may be under a menu like “Boot” or “Security.”

3. Use the arrow keys on your computer keyboard to navigate to the option related to USB boot or USB devices.

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4. Press the corresponding function key (e.g., F5, F6) to move the USB boot option to the top of the boot order.

5. Save the changes and exit the UEFI or BIOS settings.

Now, your computer should be able to boot from a USB flash drive without encountering the EFI USB Device Block Error. Remember to restore the boot order to its original settings after you’re done using the USB device.

If you continue to experience issues or need further assistance, consider seeking help from online forums like Reddit or consulting a professional technician.

Resolving the Secure Boot Issue

Secure padlock with a chain

If you are encountering the “EFI USB Device Blocked by Current Security Policy” error, here are some steps to resolve it.

First, restart your computer and access the firmware settings by pressing the appropriate function key during startup.

Navigate to the Secure Boot settings and disable it. This will allow you to boot from an EFI USB device.

If you are using Windows 11, you may need to enable the Legacy Boot option in the firmware settings.

Next, insert the USB flash drive that you want to boot from and restart your computer.

During startup, press the appropriate function key to access the boot menu and select the USB flash drive as the boot disk.

If you are still encountering the error, it may be helpful to update your firmware or reset the system to its default settings.

Remember to save any important data before proceeding with these steps.

If you need further assistance, you can consult online forums like Reddit or reach out to the manufacturer’s support team.

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Troubleshooting USB and UEFI Problems

  • Check USB device compatibility
    • Ensure the USB device is compatible with the system’s UEFI firmware version.
    • Refer to the manufacturer’s documentation or website to verify compatibility.
  • Update UEFI firmware
    • Visit the motherboard manufacturer’s website and download the latest UEFI firmware update.
    • Follow the manufacturer’s instructions to update the UEFI firmware.
  • Disable Secure Boot
    • Restart the computer and enter the UEFI setup utility by pressing a specific key during startup (typically Del or F2).
    • Navigate to the Secure Boot settings and disable it.
    • Save the changes and exit the UEFI setup utility.
  • Disable USB security policy
    • Restart the computer and enter the UEFI setup utility.
    • Navigate to the USB security policy settings.
    • Change the policy to allow USB devices.
    • Save the changes and exit the UEFI setup utility.
  • Reset UEFI settings
    • Restart the computer and enter the UEFI setup utility.
    • Locate the option to reset UEFI settings to default or optimized defaults.
    • Select the option and confirm the reset.
    • Save the changes and exit the UEFI setup utility.
  • Update USB drivers
    • Open Device Manager by pressing Win+X and selecting Device Manager from the menu.
    • Expand the Universal Serial Bus controllers category.
    • Right-click on each USB device and select Update driver.
    • Choose to automatically search for updated driver software.
    • Restart the computer after updating all USB drivers.
  • Scan for malware
    • Run a reputable antivirus or antimalware software to scan the system for any potential malware infections.
    • If any malware is detected, follow the software’s instructions to remove it.
  • Consult technical support
    • If none of the above steps resolve the issue, contact the manufacturer’s technical support for further assistance.
    • Provide them with detailed information about the problem and the steps already taken.
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python
import winreg

def is_efi_usb_blocked():
try:
key_path = r"SYSTEM\CurrentControlSet\Control"
with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, key_path) as reg_key:
val_name = "SecureBoot"
secure_boot_value, _ = winreg.QueryValueEx(reg_key, val_name)
return secure_boot_value == 1
except FileNotFoundError:
return False
except Exception as e:
print(f"An error occurred: {e}")
return False

if __name__ == "__main__":
blocked = is_efi_usb_blocked()
if blocked:
print("EFI USB device has been blocked by current security policy.")
else:
print("EFI USB device is not blocked by current security policy.")

Recommendations for Fixing the Blocked Device Error

If you are encountering the “EFI USB Device Blocked by Current Security Policy” error, here are some recommendations to fix and disable the warning:

1. Access your computer’s BIOS settings by restarting your system and pressing the appropriate key (often Del or F2) during the boot process.
2. Look for an option related to “Secure Boot” or “UEFI Boot” in the BIOS settings.
3. Disable Secure Boot or UEFI Boot to resolve the blocked device error.
4. Save your changes and exit the BIOS settings.
5. If the error persists, try updating your computer’s BIOS firmware to the latest version provided by the manufacturer.
6. If the issue still persists, consider resetting your BIOS settings to their default values.
7. Contact your computer manufacturer’s support or consult relevant online forums for further troubleshooting assistance.

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