Rooting will trip the Knox counter to 0x1, which permanently disables Samsung Pay and may void your warranty. How to ROOT Samsung Galaxy S5 Easily
A typical root zip for this device, specifically the CF-Auto-Root-kltecan-kltevl-smg900w8.zip , includes: Download g900w8 root zip
Enable in "Developer Options" (tap "Build Number" 7 times in "About Device" to unlock this menu). Download and install Samsung USB Drivers on your PC. Rooting will trip the Knox counter to 0x1,
: Power off the phone, then press and hold Volume Down + Home + Power until a warning appears. Press Volume Up to continue. Flash in Odin : Connect the phone to your PC via USB. specifically the CF-Auto-Root-kltecan-kltevl-smg900w8.zip
(Canadian model, codename ), the standard method is using the CF-Auto-Root package by Chainfire. Download Package Content