twrp fail

I can't figure out why my attempts to root my new On5 continue to fail halfway through. I've tried different Odin versions... can anyone offer some help, please? can I use the AP_G550T1UVU1APF1_CL8180604_QB9902404_REV00_user_low_ship.tar.md5 stock rom...? thanks for anyone's kind help... Glenn