Keyboard not working at Secure Boot screen

[Dover222]

Need help booting my system. I changed the  setting below from

Legacy Support Disable and Secure Boot Enable

to

Legacy Support Enable and Secure Boot Disable.

The system rebooted to this screen, see below. But I'm unable to type the pin.  I've tried entering the pin and hitting enter but nothing happens.   I've tried different USB keyboards and ports but nothing types in. I've seen youtube videos of people showing this screen and the numbers should show up under the pin in the screenshot.   I'm submitting this help from a different system because this system can't boot. How can get past this screen? Please note the system was fully functional before I made this stupid mistake. I've tried booting back to BIOS setup  by holding F10 but the system boots straight back to here. The system is not under warranty so that's not an option. Thank you

[Dover222 · Accepted solution]

I fixed my issue.  I assumed all USB keyboards are alike.  No.  previously I tried two other keyboards without any luck.  The third keyboard i tried was a Lenovo brand it WORKED.