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.
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.
@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!
@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.