Question [Q] Help Needed!

First of all i would like to tell you that i am a newbie

I rooted my Samsung Galaxy S 4 (SGH-i337) Having info as follows --

Firmware Version : 4.3

Baseband Version: I337UCUFNB1

Kernel Version: 3.4.0- 1921628 se.infra@R0304-06 #1

Build Number: JSS15J.I337UCUEMK2

Now after rooting my wifi is not working when I switch it on its shows error and turn back off. If someone could please help me get my wifi back without unrooting or bricking my device I would really appreciate it. Please remember I am a newbie please talk English. I found tons of ways to solve the Wi-Fi problem but cannot find the PDA file to flash using Odin if anyone could find that file for me for my specific phone I would be more than happy or if anyone has an easier method to get the Wi=Fi working again please let me know thanks!