You can verify a file has not been tampered with by checking its signature. More information on how to do this can be found here.
N920a Combination Firmware
Its nice for sure, there arent a whole lot of options to choose from but definitely a good one. I just installed the slim custom rom and now am on the defender rom, both have xposed installed but neither has touchwiz home launcher which i didnt like but can be changed by copying the touchwiz folder in system/privapp to sdcard/download and after installing rom boot into recovery and copy the ...
So check the below step by step tutorial of Flashing official TWRP recovery in Samsung galaxy Note 5 (Sprint) by using ODINv3.0 after flashing TWRP you can flash latest Super Su to root your Samsung Note 5 Sprint N920P.