Write imei of sm-g929f alt after exploit

Welcome to Octoplus/Octopus Box Samsung software version 2.1.9
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To connect SM-G925F 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-G925F
Selected file: C:\Users\Tavolo-3\Downloads\cert-sm-g925f-
rf8g32f6w1t_359521061219780.cert
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-G925F
Selected file: C:\Users\Tavolo-3\Downloads\cert-sm-g925f-
rf8g32f6w1t_359521061219780.cert
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G925F
Firmware compiled date: Fri Sep 25 16:06:47 KST 2015
PDA version: G925FXXU3COI9
CSC version: G925FITV3COI6
SW version: G925FXXU3COI9
Phone SN: RF1D45EJGGR
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G925F-Unknown03-02-2016_14-36-55-.asec
file
Checking Certificate file…
Certificate file successfully checked
Deactivating MSL…
Executing exploit…
Exploit has been executed successfully

and no way to keep conclude cert write…

tried with firmware downloaded from support+root bu no way :S