My SM-N900T isn't reading my SIM Card after doing some stuff to my phone, most notably flashing from 4.3 to 4.4. I tried flashing a ROM for the old boot loader (because I'm dumb) and of course got boot loop. I've done this before, I believe, and was able to Odin back to stock and all was fine, so I fired up Odin. I figured I'd pull a 'two birds, one stone' and flash the newest version of the software on the phone while I had it open. When the phone came back up it it just had a crossed out sign where the signal indicator should be in the status bar. I got a SIM Card app over wifi and it didn't see a SIM Card. I tried another card and it didn't see that either. I've tried reflashing with multiple different variables, but to no avail.
Flashed 4.4 ROM on 4.3 Bootloader
Odin'd up to 4.4
Can't see SIM Cards