g920 root file needed


I want root file for g920f
where in suport area
samsung /for unlock and repair

Welcome to Octoplus/Octopus Box Samsung software version 2.1.5
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To connect GT-I9070 phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->Applications->Development.
3. Turn on "USB Debugging" option.
4. When message is appear press "Yes".
5. Go to dial window.
6. Enter "*#7284#" number.
7. Set "UART" radio button to "Modem" value.
8. Press Home button.
9. Press "Read Info" in software.
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To connect SM-G920F phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
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Platform: Samsung Android
Selected port: COM1
Selected model: SM-G920F
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G920F
Firmware compiled date: Tue Jul 21 13:17:20 KST 2015
PDA version: G920FXXU2BOG8
CSC version: G920FITV2BOG8
SW version: G920FXXU2BOGE
Phone SN: R38GA0BA9YT
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is not Rooted.
Phone unlocking failed