cant root s6 g920i

Operation: Unlock
Selected model: SM-G920I
Software version: 24.4

Waiting ADB device…
Please, allow USB debugging on phone… OK
Reading phone info…
Model: SM-G920I
Android version: 5.1.1
Product code: SM-G920IZKAKSA
Phone version: G920IDVU3DOJ6
PDA version: G920IDVU3DOJ6
CSC version: G920IKSA3DOJ1
CSC country code: KSA
CSC sales code: KSA
HW version: MP 0.800
Phone S/N: R58G51P3F5D
Modem board: SHANNON333
RF cal date: 20150521
IMEI:
Checking Super user right… false
This model not supported for auto root

Done with Samsung Tool PRO v.24.4
plz guide:confused: