Det är ett känt problem. Du måste flasha om stock ROM, ibland får man t.o.m flasha den 2 gånger för att få fungerande WIFI.
Jag skulle prova flasha in senaste stock ROM. Fungerar den inte så kan du gå tillbaks till 3's stock ROM.
Här har du senaste stock ROM:
https://docs.google.com/file/d/0B49Ku2cA_MKTazMxV1N0ZkZPTW8/edit
Installation Instructions kopierade från XDA och tråden för Omega:
1. Flash Stock I9505XXUAME2 with odin, get the firmware from here.
2. Make sure your all are working ok with stock XXUAME2,
check it wifi- LTE (if your provider supports LTE) are working.
If wifi and LTE aren't working flash again stock rom with odin, read the reports about this here and here
3. Flash TWRP Recovery with odin, get it from here
4. Boot to TWRP Recovery and flash Omega Rom,
DO NOT WIPE (FORMAT) SYSTEM FROM RECOVERY - again DO NOT WIPE (FORMAT) SYSTEM FROM RECOVERY
Wipe data from recovery is not needed, wipe your data only if you want to.
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