Installing TWRP Fail!! Please check this out!

Ok guys Ive tried every post I can find on getting TWRP on my phone. I have the latest Odin3 v3.10.6.exe, the latest TWRP, twrp-2.8.7.0-trltespr.img.tar and tried, openrecovery-twrp-2.8.5.0-trltespr.img.tar, I have followed the posts and pulled the usb, then the battery for 30 seconds. I have unchecked the auto reboot, left it checked, tried it in the AP and BL slots and I cant get a custom recovery to stick. Here is the stats on my phone, Im at my wits end with this any help or suggestions would be much grateful. Ive already bricked it with cf autoroot and reinstalled the stock rom. Im wondering if I shouldn't of let it auto activate? Does sprint have a kill mode now for TWRP?

Software Version, N910PVPU4COG5
HARDWARE VERSION N90P.O5
ANDROID VERSION 5.1.1
BASEBAND VERSION SAME AS SOFTWARE VERSION
KERNEL VERSION
3.10.40-530320
DPI!SWHE8820 #1
BUILD NUBMER
LMY47X.N910PVPU4COG5
SECURITY SOFTWARE VERSION
MDF V2.0 RELEASE 1
VPN V1.4 RELEASE 5.2
KNOX VERSION
KNOX 2.4.1