When your computer system is damaged and the computer does not turn on and cannot be used properly, you need to reinstall the system. But at this time, you don't have a PE USB flash drive in your hand to reinstall the system! At this point, you can use your mobile phone to make a PE USB flash drive.
Preparation: A mobile phone, a USB flash drive of no less than 8G, an OTG adapter (or USB to Micro Type-C adapter), and a computer that needs to be reinstalled (you can do without it, after all, you can be prepared).
Start Making:1Mobile phone computer browser ** software etchdroid (github open source project).
2.Select the APK file in the "Last Release with DMG Support" bar.
3.Install etchdroid in your phone
4.**Windows system image.
The mobile phone browser directly searches for windows10** or windows11** and enters the Microsoft official website**Original image file (or search for reliable**system image**. Here we take the Windows 11 image of Microsoft's official website ** as an example).
Pull down after entering.
Finally, click on "64-bit download" ** mirror.
5.Open etchdroid locally on the mobile phone and open the OTG function of the mobile phone to connect to the USB flash drive (select the first one according to the presentation requirements).
Select the ISO file you just **.
Select the drive (USB flash drive).
Allow access. 
You can then pull down the notification bar to see the progress, and mobile phones are not recommended at this time. If you do not see the progress in the drop-down notification bar, you can re-enter the software authorization notification permission.
Finally, the computer system can be reinstalled normally.