If you computer did not come with Windows 8.1 then it will be back to Windows 8.0? But, do not panic if the upgrade to 8.1 did not show in the app store after the reset, because you have to download all the updates of the old Windows 8.0 and then Microsoft will offered you the 8.1 upgrade again. How to reset a Lenovo Labtop. Model Used T430, x-series.