Lenovo UNLOCK KEY HINT NUMBER password reset service:
 

Example code (from 1st listing picture) ->

Unlock Key Hint Number: [90326A26]
 
 
Just send us the UNLOCK KEY HINT NUMBER code (8-hex characters), and include a picture.
 
NOTE: A picture of code is necessary in order to prevent any time delay in case of a typing error.
 
With the password that you receive you will be able to gain access to Setup/BIOS options in your computer, you will be able to reconfigure and modify boot options, enable/disable hardware, among many other options inside Setup/BIOS.
As always, the computer manufacturer is your first best option.

Compatibility list:
ThinkPad 8 tablet
ThinkPad 10 tablet (Type 20C1, 20C3)
ThinkPad 10 tablet (Type 20E3, 20E4)
Other ....