mobile

Hi- I have a G920I that I just rooted with Odin. After that I installed TWRP manager and used it to install TWRP recovery. On reboot i am stuck at the black and white powered by android screen. I can reboot the phone with the volume down and power button combo but i cannot get it to boot into download mode using volume up+home+power buttons. I've read 100 threads but i can find anyone with the resolution to my issue. Any ideas?