wifi doesn't works on galaxy s4

i try to turn on the wifi, and it turn off for itself, and the bluetooth too.
So, i followed this tutorial:
1. Root your phone
2. Download Root Explorer.apk, put it on your phone via USB, install it
3. navigate to either /data/misc/wifi or /system/etc/wifi
4. rename or delete wpa_supplicant.conf
4.5. reboot
5. ???
i followed the tutorial i deleted the archive in the data and system, but not appeared a new one, and the wifi still not working
Please help me! (and sorry for my bad english )

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