If you are not a laptop repair professional, it is recommended to seek assistance from a qualified repair technician.

This is the Lenovo official BIOS version BHCN45WW. I have already written your original DMI information into it. Try it out and see if the laptop displays normally. If it does, you can proceed to repair the L23 inductor to fix the keyboard issue.

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Hello, brother. I am from China. Is your motherboard model NM-C221? If so, the issue with your laptop's keyboard not working is actually not a BIOS problem. This laptop has a common defect. You need to remove and replace the L23 next to the keyboard chip U22, or you can connect L23 with wires. The problem with this machine is that L23 is faulty. When L23 is broken, it causes the keyboard to stop working in PE and Windows, but it still works in BIOS. So, all you need to do now is update to the latest version of BIOS and replace L23.

You need to upload the backup BIOS file

Official website separation BIOS...