About Windows 10 Test Mode
The kernel-mode code signing policy requires that all Windows 10 drivers shall be digitally signed by Microsoft. But that’s not so practicable and pretty time-consuming. Therefore, Microsoft added the Test Mode to enable developers of drivers to test programs without having to provide an authentication certificate. Under the Windows 10 test mode, users can load and install unsigned drivers, and the Windows 10 test mode watermark will display.
Method 1. Use Command Prompt to Remove Test Mode Watermark in Windows 10
To remove the test mode watermark in Windows 10, you could use Command Prompt to fix it. Follow these steps:
Step 1. Open Command Prompt as an Administrator
Step 2. Type in the following command and hit Enter
bcdedit.exe -set loadoptions ENABLE_INTEGRITY_CHECKS
Step 3. Enter the command below and press Enter
bcdedit.exe -set TESTSIGNING OFF
Step 4. Close the Command Prompt window
Step 5. Reboot your computer to make changes take effect