Thanks for the screenshot.
First of all, on your new Windows 10 install, go to Control Panel > Bitlocker, disable it first.
Then on a different computer if you have access, download this wifi driver: https://download.lenovo.com/consumer/mobiles/ur...
And then download this BIOS: https://download.lenovo.com/consumer/mobiles/em...
Transfer them via a flash drive for example, to install them on your computer.
Then try to see if wifi is back on and if you can now upgrade to 11.
Note: This is not Microsoft website/URL, but it is the official OEM/manufacturer site.