Note 5 N920T IMEI Null Executing exploit failed

[dawd]

Welcome to Octoplus/Octopus Box Samsung software version 2.2.2
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To connect SM-N920T 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: COM81
Selected model: SM-N920T
Selected file: F:\Users\Front Desk\Desktop\Samsung\Note 5\Certif
\Copied from customer\SM-N920T_RF8G82GJ83W_353756071370654_
5-11-2015_19-53-41.cert
Detected phone model: SM-N920T
Firmware compiled date: Fri Dec 4 17:27:12 KST 2015
PDA version: N920TUVS2COKC
CSC version: N920TTMB2COKC
SW version: Unknown
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\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-N920T-Unknown16-03-2016_17-53-29-.asec
file
Checking Certificate file...
Certificate file successfully checked
Deactivating MSL...
Executing exploit...
Executing exploit failed
Writing Certificate failed
Performed by 2.2.2 software version

I'm trying to repair IMEI on Note 5 N920T COKC version. Someone else tried to unlock the phone before and it was stuck on Samsung logo when I got it. So, I don’t have nv-data or any backup to restore.

I tried to repairing EFS, write certificate and writing another phone nv-data but no luck so far.

I also tried similar things using Z3X box and at some point it was saying Security damaged.

The phone IMEI shows null/null and the process on Octoplus I’m getting Executing exploit...

Executing exploit failed, Writing Certificate failed message.

What is the right way to fix this? I’ll appreciate any help!

[jrtran]

Can you try to flash the modem bin only to get the baseband back? Then write cert again.

[Octopus box]

Hello.

As You can see from Software log, phone's modem part is damaged:

SW version: Unknown

This can be Software (modem firmware or EFS is damaged, or You have written unsuitable firmware) or HW problem.

You should re-flash the device with different firmwares one by one and check, whether modem is correct (not Unknown). And only then (when phone's modem part will be correct) perform "Repair EFS" and "Repair IMEI" operations. It is not possible to repair IMEI, if phone's modem part is damaged.

If after writing of all firmwares, which You have, phone's baseband is still null or unknown (SW version is Unknown) - most likely, this is HW problem (problem with eMMC flash chip).