When you download OS image or firmware file from Service Portal, you may find the file format is ZIP.
This post describes how to unzip file as an acceptable file for update the OS or firmware, and how to check if the PFU file is broken.
If you don't use 3rd party applications to zip/upzip the files and folders, refer to below article and follow To unzip (extract) files or folders from a zipped folder.
(for Windows 10, Windows 8.1)
After unzipping the zip file, copy the PFU file and md5 file to root folder of internal storage.
Then, follow the steps as below article.
Broken PFU can damage your device and system. It is recommended to check the PFU file before update using the file.
To check if the PFU file is broken or not,
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