I have been given this computer and need to do a factory install of osx Sierra on a blank drive
Start here: How to reinstall macOS from macOS Recovery - Apple Support. See the section on "Other ways to install macOS."
i reinstalled Mountain lion from a time machine backed up Thursday.
i you situation, you need to factory reset the macbook air.
press option while restarting and select restart with my original OSX-sbow leopard.
if you can get a copy of that snow leopard usb that will work as well
then you can build up to what ever OSX you can find.
i hope this helps!
macbook air late 2010. no back up or restore capability. how to install osx Sierra from the beginning
