Originally Posted by jamadi1377
No But if i have to do it then just tell me how !
Well, here's the deal. I think you might have not wiped data when you upgraded. If you did, ignore the following.
If you didn't wipe data, you can either do a factory reset and see if it fixes your problem, or, root your phone, and delete the /data/misc/wifi folder with a root file manager, and then reboot, and check your wifi. (You will lose all saved wifi access points).
I don't know which version of JB you upgraded to, but for rooting I'd recommend you check the towelroot thread in the General section, it might be your easiest option for rooting. I haven't used it personally, but it seems to be working.
First thing you should do also, is read the Stock FTF thread
and more importantly the All-in-one thread
MB525 - Bayer Camera - Slim-mb526-4.4.2.beta.2.4-UNOFFICIAL-20140120-1830
Sony Xperia TX LT29i - CARBON-KK-UNOFFICIAL_Hayabusa_build7