Hi! Here’s Dell’s English video showing how to create a Windows 10 installation USB and perform a clean installation:
https://www.youtube.com/watch?v=dq9CDYcivhY
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You’ll need a blank USB drive of at least 8 GB. Back up your important files first, as a clean installation removes your files and installed apps.
Windows 10 download link: https://www.microsoft.com/zh-cn/software-download/windows10