G920t trying to unlock network lock but fail

hi team plz check why it fail


Welcome to Octoplus/Octopus Box Samsung software version 2.2.6
Platform: Samsung Android
Selected port: COM5
Selected model: SM-G920T
ADB server killed.
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G920T
Firmware compiled date: Thu Jun  2 17:15:25 KST 2016
PDA version: G920TUVU4EPF1
CSC version: G920TTMB4EPF1
SW version: G920TUVU4EPF1
Phone SN: R58G31XB4KW
Android version: 6.0.1 (MMB29K)
Country: USA
HW platform: exynos5
HW Chip: exynos7420
HW Modem: SHANNON333
Codename: zerofltetmo
Checking Root:
Phone is Rooted.
Reading security backup, please wait...
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
Unlocking phone...
Deactivating MSL...
Executing exploit...
Executing exploit failed
Phone unlocking failed
Performed by 2.2.6 software version