Default I9505 4.4.2 Wifi Problem

Hello Guys! I need Your Help!
Everytime when i flash a Rom with 4.4.2, my Wifi stops working. Its not opening! I searched on Google etc and found out, that you need to flash the XXUFNA1 Modem. Okay, i did. Still not working! Can somebody help me? I dont want to use **** 4.3