If you need to fall back to the Windows8.1 system after you upgrade to the WINDOWS10 system, follow these steps:
1. Click the "Windows" icon at the bottom left of the desktop using the left mouse button.
2. Click "Settings" in the menu.
3. Click "Update and Security".
4. Click "Restore".
5. Click "Back to Windows8.1" below the "start". (Note: This option is only available for one months after you upgrade to WINDOWS10 and cannot be rolled back to Windows8.1 for more than one months)
6. Choose the reason for the fallback (optional) according to your personal situation, then click Next.
7. Please read carefully, the whole process needs to connect the power adapter, in order to avoid affecting your files, you can back up the important files, please understand and take measures, click "Next".
8. If your Windows8.1 system has set the password, the back-back password will be restored, so you need to know the password, confirm that the hint will not affect your use, click "Next".
9. Click "Fall back to Windows8.1", the system automatically restarts, and start the rollback process, the process takes some time, back to the Windows 8.1 system still remain active.