error to unlock g920t1

Bienvenido en Octoplus/Octopus Box Samsung software versión 2.1.5
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To connect SM-G920A 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-G920T1 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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Plataforma: Samsung Android
Puerto seleccionado: COM22
Modelo seleccionado: SM-G920T1
Searching for a phone. Please wait…
ADB server killed.
Phone found.
Fecha de creación del firmware: Tue Mar 31 04:30:13 KST 2015
PDA version: G920T1UVU1AOCH
CSC version: G920T1TMB1AOCH
Versión del SW: G920T1UVU1AOCH
IMEI del teléfono: Unknown
Phone SN: R58G60CD11K
Android version: 5.0.2 (LRX22G)
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Plataforma: Samsung Android
Puerto seleccionado: COM22
Modelo seleccionado: SM-G920T1
Modelo del teléfono detectado: SM-G920T1
Fecha de creación del firmware: Tue Mar 31 04:30:13 KST 2015
PDA version: G920T1UVU1AOCH
CSC version: G920T1TMB1AOCH
Versión del SW: G920T1UVU1AOCH
Phone SN: R58G60CD11K
Android version: 5.0.2 (LRX22G)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G920T1-Desconocido21-01-2016_18-02-
42-.asec file
Deactivating MSL…
Executing exploit…
Executing exploit failed
La liberación del teléfono ha sido fallada
please helpme no unlock say failed