I can flash any firmware. That's not a problem. It's just that after using max Lee's (old way) rooting method I will flash twrp 3.0, and it won't boot to recovery. It's obviously a kernel issue. Ugh. This kernel flashed with recovery is a pain. Lol.Hmm odd. Can you get into download mode? You might can use ODIN to flash the Android 4.1.2 stock MD8 firmware tar file which will flash over anything you currently have.