G920T Cert write fail help

Welcome to Octoplus/Octopus Box Samsung software version 2.3.7
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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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To connect SM-G920T 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: COM127
Selected model: SM-G920T
Selected file: C:\Program Files (x86)\Z3X\Samsung\SamsungToolPRO\backup\Cert\SM-G920T_R58G80841TZ_359358062128219_11-6-2016_14-54-31.cert
Detected phone model: SM-G920T
Firmware compiled date: Fri Aug 5 15:48:58 KST 2016
PDA version: G920TUVS4EPH2
CSC version: G920TTMB4EPH2
SW version: G920TUVS4EPH2
Phone SN: R58G92MP8SW
Android version: 6.0.1 (MMB29K)
Sales code: TMB
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 (x86)\Octoplus\Octoplus_Samsung\BACKUP\Security-SM-G920T-Unknown29-09-2016_17-52-55-.asec file
Checking Certificate file…
Certificate file successfully checked
Deactivating MSL…
Executing exploit…
Executing exploit failed
Writing Certificate failed
Performed by 2.3.7 Software version.

It has root, tripped knox, i put in a eng sboot from another thread i found still not working