G920T 5.1.1 CERT write failed


Welcome to Octoplus/Octopus Box Samsung software version 2.1.9
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To connect SM-N915F 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.
6. Go to dial window.
7. Enter "*#0808#" number.
8. Select "DM+Modem+ADB".
9. Press Home button.
10. Restart phone.
11. Press "Read Info" in software.
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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: COM4
Selected model: SM-G920T
Selected file: K:\Octopus\CERT\SM-G920T_357746060831994_
0346.cert
ADB server killed.
Proper android device not found. Make shure that "USB debug" option
on the device is turned on.
Writing Certificate failed
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Platform: Samsung Android
Selected port: COM4
Selected model: SM-G920T
Selected file: K:\Octopus\CERT\SM-G920T_357746060831994_
0346.cert
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G920T
Firmware compiled date: Mon Nov 30 10:58:17 KST 2015
PDA version: G920TUVS3DOJC
CSC version: G920TTMB3DOJC
SW version: G920TUVS3DOJC
Phone SN: 00000000000
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G920T-Unknown03-02-2016_18-43-28-.asec
file
Checking Certificate file…
Certificate file successfully checked
Deactivating MSL…
Executing exploit…
Executing exploit failed
Writing Certificate failed

solution please