[SOLVED] What causes "Testing Mode" watermark?

Discussion in 'Windows 10' started by heyhachi, Feb 24, 2021.

  1. heyhachi

    heyhachi MDL Novice

    Feb 23, 2021
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    Hi,
    I am using Windows 10 Pro 20H2, 19042.804. There is a watermark showing "Testing Mode, Windows 10 Pro ..." on desktop. It seems that this watermark is displayed if a driver or a program is not digitally signed by Microsoft. In order to determine which driver is not signed, I used sigverif. It found 340 driver. 339 driver is signed by Microsoft and 1 driver (wdfcoinstaller01011) is not installed. I also used dxdiag and verified that display and sound card drivers are signed. In addition to that, I used Driver Verifier Manager (verifier) and ıt did not found any unsigned driver.

    I am wondering what might cause "testing mode" watermark to be displayed if there is not any unsigned driver? Could you help me in this regard?

    P.S.: My native language is not English.
     
  2. kaljukass

    kaljukass MDL Guru

    Nov 26, 2012
    2,355
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    Try this.
    Usually You can disable this by following the steps below:
    • Run Command Prompt as administrator
      Note: If you are prompted by a User Account Control window, tap or click Yes.
    • In the Command Prompt window, type the following command, and then press Enter:
    • bcdedit -set TESTSIGNING OFF
    • After you see the confirmation, close the Command Prompt window.
    • Save any unsaved work, and then restart the computer.
     
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  3. heyhachi

    heyhachi MDL Novice

    Feb 23, 2021
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    @kaljukass ,
    I should have mentioned that I found the solution that you have provided in my first message, sorry. I am sure that I do not enable this test mode and wondered why it is enabled. Anyway, I am going to use your advise and disable it via bcdedit.
    Yhank you!
     
  4. Gharlane00

    Gharlane00 MDL Addicted

    Aug 26, 2009
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    I would be concerned about Malware. You don't get into Testing Mode by accident.
     
  5. heyhachi

    heyhachi MDL Novice

    Feb 23, 2021
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    @Gharlane00, as your hint I scanned my computer by anti-wirus and anti-malware software and nothing was found. Although we could not found the root cause, I consider this as solved. I did not want to blindly run command to turn test mode off. Thank you @kaljukass for your elaborate answer and thank you @Gharlane00 for your hint.