Device is bricked!!!!!

Please help! I'am using model SM-N900. Today, I wanted to downgrade from my 5.0 custom ROM to stock 4.4.2. I downloaded the 4.4.2 firmware and opened ODIN. I selected AP mode and selected the .tar.md5 file I extracted and it loaded it up. I booted the phone into download mode. I selected auto reboot and F. Reset time. I clicked start and it started. It went along well until it got to system.img in which it stopped and failed. Now I tried a lollipop image, and it came up with the same result. I tried flashing the TWRP image and it flashed successfully. I was able to boot into TWRP and use it. I now tried flashing a custom rom. I tried a AOSP lollipop rom, 5.0 TW rom, and a 4.4.2 TW rom and they all booted to a black screen. I'am now desperate to fix my seemingly bricked device so somebody out there, please help! Thanks in advance.