A few months ago I rooted using CF-Auto-Root and everything was working fine. I made no other changes.
Last night I tried to update the phone using Kies so I could start using the WIFI calling. It seemed to update fine and started up but the WIFI was off. Now it cannot be turned on. Slide the switch to ON and it immediately switches back to OFF. I eventually did a factory reset on the phone but that did not resolve the problem. But it did start showing a message when I try to turn on WIFI that security software has disallowed the action. I went into SuperSU and it asked to turn of Knox. I did that. Now the message doesn't come up any more but WIFI still can't be turned on.
Can anyone offer any advice on what I should do next?