Since upgrading to iOS 8.3 I know have no wifi. It was mine before the upgrade

I Need help to get my wifi back on. It was fine before the upgrade to 8.3

I don't know why this is the most frequently problem after update.I have the same problem but in  my case I run ios 8.1.3 with wifi greyed out (after update) and I want to update to 8.3 hoping to fix this problem,but to be honest I'm affraid:)) I suggest to downgrade the ios,maybe it returns to normal.

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