Lenovo Legion Y520-15IKBN 80WK black screen after 4KCN45WW bios update

Hi everyone!!

I’m new here and i would like to ask for your help, if possible.

I have a problem with my laptop after an official windows (*.exe) bios update (i tried to update to 4KCN45WW bios). Everything went ok, but after reboot, the screen was black and bios was not loading. The laptop model and bios “.exe” file is this: pcsupport.lenovo.com/es/es/products/laptops-and-netbooks/legion-series/legion-y520-15ikbn/80wk/80wk0160sp/pf10cv81/downloads/driver-list/component?name=BIOS

I have made a copy of my non-working bios (attached to this post) with a CH341A programmer + clip, thanks to your guide.

I’ve also tried to flash backup bios from other Win-Raid forum users, with no luck, screen still black and bios not loading.

I’m lost. I think i have the solution in front of me, but i’m not able to make my laptop revive. Can you help me, please?. I’d like to learn.

Thank you very much.