I downgraded windows 10 to windows 8.1, now I can't connect to the internet.

I can't even factory reset.

There is multiple problems after I downgraded my Lenovo Ideapad 100S-iby to windows 8.1 pro n

1. Keyboard and trackpad don't work, have to use usb mouse and keyboard.

2. Can't connect to wifi, can't install wifi adapters, even tried ipconfig /all.

3. display adapters don't appear on device manager, and my display driver doesn't show up when I try legacy hardware.

Can I fix these? If yes, how?

Lenovo would have to supply Windows 8.1 Drivers for that exact model number.

Do they?

Well no, so I basically messed up the computer.

I would assume the only way if there is a way, is to upgrade back to windows 10, but I can't. Considering there is no internet. Could I download it through a usb?

As it came with Windows 10, do a clean install of 10.

As you can get here, you will have access to the Net for downloading 10 via USB.: