mobile

Hi! I am having major issues with my s4 i337 after switching from att to tmobile. The phone was unlocked so I took it upon myself to unlock it. It is unlocked but sometimes or rather most of the time does not pick up the network. When it does have data connection, it is Edge. I flashed the NC1 to root my phone, then reflashed to NJ4 (to unlock) but now nothing works. No wifi, camera fails, no multitasker, no voice assistant. Please help!!!!! I don't know what to do. I should have never unrooted it to unlock. I should have paid the to get an unlock code. Can I fix this?

I have tried multiple APN settings,
Tried reflashing what I found online as att official firmware but it fails on ODIN.
So reflashed to NJ4, it is a bit laggy as well. Tried wifi which is greyed out, Camera still shows failed, pressing the home button to open multitasker and voice assistant brings up a blank grey screen. Phone is no longer connected as a mass storage device, only charges and can connect to ODIN.

I have attempted to factory reset which doesn't go through, unroot through SU which gets stuck on uninstalling and even trying to do an emergency recovery on Kies where it fails and gets stuck on kies failure mode.

I am on 4.4.4