G935T unlock REV9 problem! please help

Welcome to Octoplus Box Samsung software version 2.7.9
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To connect SM-G935T 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: COM1254
Selected model: SM-G935T
Operation: Unlock
Searching for a phone. Please wait...
Please, press "OK" button on the phone to allow USB debugging.
Detected phone model: SM-G935T
Firmware compiled date: Fri Feb 8 16:46:54 KST 2019
PDA version: G935TUVS9CSB2
CSC version: G935TTMB9CSB2
SW version: G935TUVS9CSB2
Phone SN: RF8H40HECMP
Android version: 8.0.0 (R16NW)
Sales code: TMB
Country: USA
HW platform: msm8996
HW Chip: MSM8996
HW Modem: MSM8996
Security patch level: 2019-02-01
Warranty Void: 0
SIM 1 status: network locked
Codename: hero2qltetmo
Checking Root:
Phone is not Rooted.
Phone unlocking failed
Performed by 2.7.9.4 Software version.
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Platform: Samsung Android
Selected port: COM1254
Selected model: SM-G935T
Operation: Rooting
Detected phone model: SM-G935T
Firmware compiled date: Fri Feb 8 16:46:54 KST 2019
PDA version: G935TUVS9CSB2
CSC version: G935TTMB9CSB2
SW version: G935TUVS9CSB2
Phone SN: RF8H40HECMP
Android version: 8.0.0 (R16NW)
Sales code: TMB
Country: USA
HW platform: msm8996
HW Chip: MSM8996
HW Modem: MSM8996
Security patch level: 2019-02-01
Warranty Void: 0
SIM 1 status: network locked
Codename: hero2qltetmo
Detected kernel version (8.0.0) is not supported!
Rooting phone failed.
Performed by 2.7.9.4 Software version.