My iphone 4s had upgrade to ios 8.1.1 and wifi can turn on but can not detect wifi. how to downgrade ios org back in to ios 6 again?

my iphone 4s has upgrade to ios 8.1.1 and wifi can turn on but can not detect wifi. how to downgrade ios or back in to ios 6 again? i have try to restore iphone , reset all but it can't solve my problem. any one can help me?

You can't downgrade the iOS level.
Try using Settings > General > Reset > Reset Network Settings.

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