SPH-L720 WiFi is broken.
So I updated to MK2 awhile ago and it just completely broke my WiFi. So I rooted it and attempted to flash MK2 manually and that didn't work either. I attempted to flash Ktoonz kernel in hopes that it would work, nope. Then unknownforce's stock kernel and that didn't work either. It's been like this for awhile and it's finally starting to annoy me.