writte G800F cert file

plz i av tried to writte G800f cert file without success first i av rooted the phone

Welcome to Octoplus/Octopus Box Samsung software version 1.9.2
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To connect SM-G800F 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: COM6
Selected model: SM-G800F
Selected file: C:\NEW THINK\SAMSUNG\G800f cert file\new\Cert-SM-
G800F_352960061522321_RF8F70JJEPH\Cert-SM-G800F_
352960061522321_RF8F70JJEPH.cert
Please, press "OK" button on the phone to allow USB debugging..
Please, press "OK" button on the phone to allow USB debugging..
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: COM6
Selected model: SM-G800F
Selected file: C:\NEW THINK\SAMSUNG\G800f cert file\new\Cert-SM-
G800F_352960061522321_RF8F70JJEPH\Cert-SM-G800F_
352960061522321_RF8F70JJEPH.cert
Please, press "OK" button on the phone to allow USB debugging..
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G800F
Firmware compiled date: Mon Dec 1 15:49:07 KST 2014
PDA version: G800FXXU1ANL1
CSC version: G800FOXX1AOC1
SW version: G800FXXU1AOC2
Phone IMEI: 350695200123951
Phone SN: R58F80NC5QT
Android version: 4.4.2 (KOT49H)
Checking Root:
Phone is Rooted.
Reading security backup, please wait...
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G800F-Unknown20-04-2015_09-26-09-.asec
file
Phone will restart now. Please don't disconnect cable!
Perform the following steps:
1. Connect phone via UART cable to the Box.
2. Note: phone screen must be active
Connecting to phone, please wait...
Writing Certificate failed

plz any issu to writte cert file to this phone?

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