How do I unenroll a used school/business chromebook leveno 300e?

old post, but whatever. if you already got your money back, good on you! but here's what you could've done:

First, powerwash the Chromebook. Sign in to the internet and when you get to the screen where it says “Getting device configuration” click the notification center in the bottom right corner and get ready to turn off the wi-fi. When the screen turns to “Enrolling device” Turn off the internet. It will say “Enrollment Failed” Then click the button “Enroll manually” This should pull up a screen saying “no internet”. Turn the internet back on and click the back button. Eventually, in the bottom left corner, buttons will start to appear. First, Apps (If your district has apps). Second, Browse as Guest. When Browse as guest appears, go back and forth clicking the back button and the Browse as Guest button. Eventually, the Chromebook should crash when you click browse as guest. Finally, press ESC + refresh + power and it will take you to a screen where it says “Chrome OS is missing or Damaged” Press Ctrl + Search (Ctrl +Shift on older models) and then press enter to go into developer mode. Then, the screen will say “OS Verification is off. Press space to enable” Press space to enable then press enter. Finally, the Chromebook will reboot and the enrollment should go away. If it doesn't work, then try it again.