Can't switch on WiFi

Hi guys!

I had problems with my wifi and I found a solution online saying that I should delete these three folders:
/data/misc/wifi
/data/misc/dhcp
/etc/wifi

I done that and now the phone's WiFi cannot be switched on anymore (WiFi switch stays gray and cannot be turned on).
Is there anything I can do other than a factory reset or flashing phone?
Can anyone zip up those 3 folders and post them here?

Thanks !

Phone info:
Model: Note 4 N910C
Android version: 5.1.1
Phone is rooted.

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