I recently updated my Galaxy S4 to Android 4.3; the update went 100% fine, no issues, no errors, nothing. After the apparently perfect install, I turn it on to find out WiFi WON'T turn on. The WiFi setting stays on "off" no matter how many times I click on it. I tried putting it in Airplane mode, but that didn't do anything either. I tried restoring to Factory Settings and that didn't work, either. I can't set anything up because it doesn't let me even turn WiFi on and I don't have signal because I purchased the phone unlocked. Please help me out! I have no clue what's going on. This never happened before on 4.2.2 and now I can't even use the phone. HELP!