mobile

Hello everyone I have searched high and low to try and figure out what I am doing wrong here. About 6 months ago I was set on leaving the custom firmware scene and go back to stock. Did the appropriate steps through odin and flashed the newest firmware at the time(not even sure which one it was). Anyway I had an issue with my WIFI not even being able to be turned on at all. You would tap the icon to light up but to no avail. I am back to my old custom firmware which is JEDI X20(4.1.2) and am looking to upgrade to 5.0/1(lollipop) I am sure ATT has not gotten around to updating to it for the Note 2 so I am looking to go the custom route and take one of my choosing. My only concern is will I have a problem with my WIFI again. I know I had briefly read about some modem or baseband that was needed from Gingerbread to make WIFI work? Is this still the case? Out of anything I need working it's my WIFI.

Thanks in advanced