Window 10 login pin not working after latest update

There should be option to sign in with your password. Have you tried that?

Try restarting a few times then try again.

Try disconnecting from the Internet and try again.

If that does not work, reboot in Safe Mode then try signing in.

At the sign in screen:
Hold down the shift key on your keyboard while clicking the Power button on the screen.
Continue to hold down the shift key while clicking Restart.
Continue to hold down the shift key until the Advanced Recovery Options menu appears.
Click Troubleshoot
Click Advanced options
Click Startup Settings
Click Restart
Press (4) to Enable Safe Mode
Wait while Windows 10 starts in safe mode.
Log in

If you are still unable to log in, see the following:
http://answers.microsoft.com/en-us/windows/wiki...

Other things you can try - enable to built in Administrator account:

Hold down the shift key on your keyboard while clicking the Power button on the screen.
Continue to hold down the shift key while clicking Restart.
Continue to hold down the shift key until the Advanced Recovery Options menu appears.
Click Troubleshoot
Click Advanced options
Click Command Prompt

At the command prompt, type:
net user administrator /active:yes

Hit Enter

Close command prompt, restart, then try signing into the Administrator account.

Try signing in again.

Hold down the shift key on your keyboard while clicking the Power button on the screen.
Continue to hold down the shift key while clicking Restart.
Continue to hold down the shift key until the Advanced Recovery Options menu appears.
Click Troubleshoot
Click Advanced options
Click Startup repair the follow the on screen instructions.
When complete, restart.
Try signing in again.

Please see:
https://www.tenforums.com/tutorials/7312-reset-...