First of all, you need a file explorer that gives you read access to the root folder. If your default File manager doesn’t give you the read access to the root folder, then you can install Root Explorer or Super Manager which will grant superuser permission to you to access the system folder
Go to the data/misc/wifi folder, and you will find a file named wpa_supplicant.conf.
Open the file and make sure to open the file in a built-in text/HTML viewer for the task. Now in this file, you will be able to see the network SSID and their passwords next to it.
Now note down the network name and its password. In this way, you will be able to view all saved WiFi passwords on the Android device.
Note: Do not edit anything in wpa_supplicant.conf as it can alter your device working or it will have an effect on your WiFi connectivity.
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