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Wifi can’t be used. when enabling wifi function, it will either turn off by itself or turn on but can not see available network

There are several reasons why the Wi-Fi does not turn on, I will try to describe some of them: The first reason, which is quite rare, is incorrectly set date and time. To fix it, you need to go to “Settings”, then “Date and time”, there set everything correctly. This problem often occurs when the password has been changed, but the Smartphone “does not know” about it. It is necessary to enter the settings of Wi-Fi connection, delete the profile of the network with which the connection was established and reconnect. The third reason when Wi-Fi stopped turning on is a software failure. You can try to solve the problem by using a special utility “Wi-Fi Fixer”. There is no need to change any settings in the program. Simply download and install it. If this does not help, you can reset to factory settings: go to “Settings”, then “Restore and reset” or visit this website. I hope this helps you. Good luck