Safestrap is not for your device. That's for the at&t version. You have the I9505 thus there is no protection what so ever (besides Knox).
The build number is not important for rooting or flashing custom recovery. Just use cf auto-root and you will be fine. Pick the recovery you want and flash away.
Samsung Galaxy S 4 I9505 | WanamLite v3.0
Samsung Galaxy S II I9100 : AOKP 4.2.1
HTC Touch Pro2 | ROM: Valkyrie 6.5.23115TR2.5
HTC HD2 | DarkStone1337 [FroyoStone Sense - V3.2]
HTC Desire : Oxygen v2.1.3