Hello i have a  an iPhone 5 .i updated it in the end of summer or begin of fall because i forget the number of  version.it is important that i update my i Phone by itself not with iTune . after that my device can not  join to wifi to internet but another

hello
i have a  an iPhone 5 .i updated it in the end of summer or begin of fall because i forget the number of  version.it is important that i update my i Phone by itself not with iTune . after that my device can not  join to wifi to internet but another of app works properly and cellular can join to internet . i reset my i phone in the setting . general section but my problem  is remaining .is possible that to return to older version? if there is any solution share with me and i be very thankfulness of you.tanks again 

It is not possible to downgrade to an earlier version.
Have you tried the tips on this help page? iOS: Troubleshooting Wi-Fi networks and connections
And you dont need iTunes to update you're device. You can update it OTA in Settings > General > Software Update

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