n920w8 unlock error

To connect SM-N920W8 phone you have to perform the following
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.
Platform: Samsung Android
Selected port: COM1
Selected model: SM-N920W8
ADB server killed.
Detected phone model: SM-N920W8
Firmware compiled date: Fri Mar 18 20:04:20 KST 2016
PDA version: N920W8VLU2BPC5
CSC version: N920W8OYA2BPC5
SW version: N920W8VLU2BPC5
Android version: 6.0.1 (MMB29K)
Country: Canada
HW platform: exynos5
HW Chip: exynos7420
HW Modem: SHANNON333
Codename: nobleltebmc
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
Deactivating MSL…
Executing exploit…
Executing exploit failed
Reading Certificate failed
Performed by 2.2.5 software version

android version 6.0.1
security patch 2016-04-02
need help