Hello i have a galaxy s4 sgh-1337m (rogers). I dont have any backups of stock . it seems that it was rooted when i got it. anyways i can boot to TWRP. i have tried to flash CM 10.2 , cant get it to boot , just sits at the samsung galaxy s4 screen. what can i do to get my phone back up and running. i have 4.3 jellybean i believe