It’s recommended that you first backup all files you need to keep to OneDrive.
To reset your Windows 10 machine to factory settings, Click “Start” then “Settings”
Click “Update & Settings”
Now click “Recovery” then click “Get started” under “Reset This PC”
Choose “Remove everything”
You can change the additional setting to secure erase the device if you wish
After clicking “Next” it will start the process.
When “Reset” appears as an option, click it to start the reset.
Once it has reset you can go to “Join your device to Lightspeed“