I installed updates and restarted my computer and now I am locked out. It wants me to enter a pin but I never created a pin. Only a password. Lenovo Yoga C740-15IML  Serial number ********

Moderator note: serial number removed to prevent abuse.

Hi LisHun, thanks for reaching our community. 

You may try the steps below then let me know if you have questions. 

On the Lock Screen, locate the power icon on the bottom right-hand corner.
Select the Power Icon and move your cursor over “Restart”.
Hold the Shift key down on your keyboard. While holding down the shift key, click on Restart.
There will be a message onscreen saying “Please Wait”.
The computer should reboot into recovery mode. If it doesn’t, repeat the steps above a second and sometimes even requires a third attempt.

On Recovery screen, you will be asked to “Choose An Option”.
Select Troubleshoot. Then Advanced Options.
From there, we have the option to run System Restore. However if your computer has not restore points, you may have to choose “See More Recovery Options”.
Look for “Uninstall Updates”. From here choose “Uninstall the latest feature update”.

Please Wait
This may take some time as it will roll your system back to the point before the feature update was installed.

Once the Update rollback completes, login using your password as before. If it still asks for a PIN, look for the icon below or the text that reads “Sign in Options”, and choose Password.
Enter your password and get back in to Windows.

Thanks,

Arjay_Lenovo

Thank you.  It still did not work.  I was able to get to the options, but I do not have any system restore points, do not have it backed up on a hard drive, and I tried to uninstall latest update but it said it did not work.  I got to a screen that says uninstall latest feature update and enter the recovery key to get going again.  

Yes, let us do that, uninstall the latest update. That could help us. Please try and then update us how it goes. 

Thanks,

Arjay_Lenovo

Thanks for the tip!  I am in finally!  Thanks!!

Sorry for not replying soon, but we are happy to know that it is solved already.

If you have issues again, please reach us anytime. 

Thanks,

Arjay_Lenovo