Try these steps to access safe mode:
- Boot to Windows 10 login screen. Click the Ease of Access icon at the bottom right corner and select “On-screen keyboard“.
- Hold down the SHIFT key on the virtual keyboard and don’t release it, then click the Power icon and select “Restart“.
- Choose Troubleshoot > Advanced options > Startup Settings > Restart, you can then access Safe Mode at bootup.
If you couldn’t login in safe mode, you might need to use password tool such as PCUnlocker Live CD, Offline NT Password & Registry Editor, etc.
Thanks, but I can not use your procedure because they no longer recognize my password.
I launched the tablet when I turn it off at the start you see the symbol “Teclast”. Repeat this 3 times. The fourth time you start the windows recovery and I formatted the tablet them.