[XDA Assist] mathewsjb:
UPDATE: I DONT KNOW IF CHANGING THE CABLE IS WHAT FINALLY DID IT, BUT IT IS DONE. THANK YOU ANYWAY. SORRY I POSTED SO SOON. I DONT USUALLY DO THAT. ALSO, IT WAS THE Z3X THAT FINALLY DID THE TRICK. ALSO THE FILE SIZE WAS 2.15K. ANY BODY ELSE THAT MAY WANT MORE DETAILS I WILL BE GLAD TO HELP.

Hey guys I really need some help and I am unable to find anything about it. I keep getting this error. Security damaged. I do the repair, it says its good then when I try and repair the imei it errors out. Here is the print out.

Platform: Samsung Android

Selected port: COM14

Selected model: SM-G925T

Please, press "OK" button on the phone to allow USB debugging..

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: 00000000000

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-G925T-Unknown14-10-2015_00-35-44-.asec file

Wiping EFS...

Phone will restart now. Please don't disconnect cable!

EFS wipe successfully

Searching for a phone. Please wait...

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: 00000000000

Android version: 5.1.1 (LMY47X)

Repairing security

Security repair successfully

-----------------------------------------------------------------------------------

Platform: Samsung Android

Selected port: COM14

Selected model: SM-G925T

Selected file: C:\Users\John\Downloads\cert-sm-g925t_359146060661913_r58g50kgewk.cert

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: 00000000000

Android version: 5.1.1 (LMY47X)

Checking Root:

Phone is Rooted.

Checking Certificate file...

Certificate file successfully checked

Phone connected successfully

Writing certificate...

Security damaged, please Repair Security and try again

Well I started comparing file size and the file that is in the phone is 2.15k, while the other g925t, as well as the other vairents of this cert are all 2.16k. Now when I flash with either octo or z3x I get the security damaged. I did find one file that was 2.15k and did get a successful flash, which gave me a ser #, but a defective imei. Please help.

Welcome to Octoplus/Octopus Box Samsung software version 2.0.4

-----------------------------------------------------------------------------------

To connect SM-G925T 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.

-----------------------------------------------------------------------------------

Platform: Samsung Android

Selected port: COM18

Selected model: SM-G925T

Selected file: C:\Users\John\Downloads\cert-sm-g920t-

357746060831994-r58g31myxyb.cert

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: R58G50TKDNH

Android version: 5.1.1 (LMY47X)

Checking Root:

Phone is Rooted.

Checking Certificate file...

Certificate file successfully checked

Phone connected successfully

Writing certificate...

Security damaged, please Repair Security and try again

-----------------------------------------------------------------------------------

Platform: Samsung Android

Selected port: COM18

Selected model: SM-G925T

Selected file: C:\Users\John\Downloads\Cert-SM-G900-

358021058471446-RF1D93A24AK.cert

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: R58G50TKDNH

Android version: 5.1.1 (LMY47X)

Checking Root:

Phone is Rooted.

Checking Certificate file...

Checking Certificate failed

Writing Certificate failed

-----------------------------------------------------------------------------------

Platform: Samsung Android

Selected port: COM18

Selected model: SM-G925T

Selected file: C:\Users\John\Downloads\cert-sm-g925f_

359521066036817_rf8g51vfezn.cert

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: R58G50TKDNH

Android version: 5.1.1 (LMY47X)

Checking Root:

Phone is Rooted.

Checking Certificate file...

Certificate file successfully checked

Phone connected successfully

Writing certificate...

Security damaged, please Repair Security and try again

-----------------------------------------------------------------------------------

Platform: Samsung Android

Selected port: COM18

Selected model: SM-G925T

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: R58G50TKDNH

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-G925T-Unknown14-10-2015_04-34-29-.asec

file

Wiping EFS...

Phone will restart now. Please don't disconnect cable!

EFS wipe successfully

Searching for a phone. Please wait...

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: R58G50TKDNH

Android version: 5.1.1 (LMY47X)

Repairing security

Security repair successfully

-----------------------------------------------------------------------------------

Platform: Samsung Android

Selected port: COM18

Selected model: SM-G925T

Selected file: C:\Users\John\Desktop\cert-sm-g920f_35984506420518

_rf8g410tn3e.cert

Detected phone model: SM-G925T

Firmware compiled date: Sat Sep 19 16:29:03 KST 2015

PDA version: G925TUVU3DOI1

CSC version: G925TTMB3DOI1

SW version: G925TUVU3DOI1

Phone IMEI: Unknown

Phone SN: R58G50TKDNH

Android version: 5.1.1 (LMY47X)

Checking Root:

Phone is Rooted.

Checking Certificate file...

Certificate file successfully checked

Phone connected successfully

Writing certificate...

Security damaged, please Repair Security and try again

PLEASE PUT THIS IN THE RIGHT PLACE. I AM SO FLUSTERED BY THIS I may have PUT IT IN THE WRONG PLACE.