another g925w8 5.1.1 unlock error

Welcome to Octoplus/Octopus Box Samsung software version 2.1.7
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To connect SM-G925I 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-G925W8 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.
Selected firmware file: sm-g925w8_root_android_5.1.1.oct
Selected firmware file: sm-g925w8_root_android_5.1.1.oct
Please put the phone into Download Mode and connect USB cable.
To put SM-G925W8 into Download Mode, You have to perform the
following steps:
1. Reconnect the battery.
2. Press and hold "Volume-" + "Home" + "Power ON" keys.
3. When phone turns on, press "Volume+" key.
Found phone on
Firmware write started.
Writing BOOT section…
BOOT section has been written successfully.
Firmware writing successfully completed.
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Platform: Samsung Android
Selected port: COM1
Selected model: SM-G925W8
ADB server killed.
Proper android device not found. Make shure that "USB debug" option
on the device is turned on.
Read codes failed
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Platform: Samsung Android
Selected port: COM1
Selected model: SM-G925W8
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G925W8
Firmware compiled date: Tue Nov 10 19:39:02 KST 2015
PDA version: G925W8VLU3BOK1
CSC version: G925W8OYA3BOK1
SW version: G925W8VLU3BOK1
Phone SN: R58G71GB7VN
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-G925W8-Unknown26-01-2016_17-13-21-.asec
file
Deactivating MSL…
Executing exploit…
Executing exploit failed
Read codes failed

need help
regards…