Trouble installing recovery on G900F

Hi, I am on official 6.0.1 from Samsung, I rooted my S5 using cf auto root, after that I tried to install twrp 3.0.2.0, I downloaded it from the twrp website, booted into download mode and installed it using Odin 3.10.7, it showed pass but when I tried to boot into recovery the screen went black & stayed that way. I had to remove the battery to reboot the phone but it then goes straight to download mode, no matter what I try it keeps booting into download mode. The only thing I can do is flash stock firmware.
Am I missing something or doing something wrong, I so want to get my S5 rooted & a rom installed. Thank you in advance

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