Fixing Windows Hello PINs not working after a BIOS update

This weekend I updated my Lenovo Yoga Book’s BIOS to fix some sleep issues with the device. This BIOS update came through Lenovo’s website, along with some driver updates, and not through Windows Update.

After I updated I realized two things about changing the BIOS out from under Windows 10:

  1. Bitlocker will lock your device on reboot because it thinks something deep within the hardware has changed, and that is true. Make sure you have a Bitlocker key handy. This can be generated from the Settings or is tied into your Microsoft Account (so you can access it via a phone or another device). You can get that here: http://go.microsoft.com/fwlink/?LinkId=237614
  2. The Windows Hello PIN won’t work anymore. Try as I might, I kept getting¬†an error with no error code identifiable online. Removing and re-adding the PIN threw me into a “Something went wrong” loop.

The solution to this was pretty easy and I’m writing it here to help anyone else in the future:

  1. Go to Settings > Accounts > Switch my account to a local account. Don’t worry, it won’t delete anything or change much.
  2. Go back and select “Sign in with a Microsoft Account” again. This switch from online to local or local to online and back again flips whatever’s needed in the security key and PIN settings to clear it up.

Once I did that it worked great. And the BIOS update from Lenovo is about two versions ahead of what’s in Windows Update. It fixes Yoga Book sleep issues where it requires a force reboot to load after hibernating. WiFi driver helps speed it up, too.

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