Help: Z3X BOX Samsung Galaxy S6 Edge SM-G925T IMEI Repair w/Marshmallow 6.0.1

Hello guys. This the first time repair an IMEI on a phone with the Z3X box. The phone is a Galaxy S6 Edge G925T with Marshmallow 6.0.1. This is what I have done so far:

1. I rooted the phone using CF-Auto-Root-zeroltetmo-zeroltetmo-smg925t
2. I dialed *#0808# and activated the RNDIS+ACM+DM+ADB
3. I plugged the phone to the Z3X box and selected my phone model
4. On the "Backup" tab, I selected my phone on the ADB drop down window.
5. I clicked on the "Read EFS" and it went successfully

But when I tried to "Read CERT" to back it up, this is what I get:

Operation: Read CERT
Selected model: SM-G925T
Software version: 27.1
Waiting ADB device…
Please, allow USB debugging on phone… ok
Reading phone info…
Model: SM-G925T
Android version: 6.0.1
Product code: SM-G925TZKATMB
Phone version: G925TUVU4EPF1
PDA version: G925TUVU4EPF1
CSC version: G925TTMB4EPF1
CSC country code: USA
CSC sales code: TMB
HW version: REV0.2
Phone SN: R58G51ZJ4MB
Chip name: EXYNOS7420
Modem board: SHANNON333
RF cal date: 20150525
Checking Super user right… true
Initialization zTool… ok
Running zTool, please wait…
Start… ok
Initialization… ok
Generate and check client proof… ok
Verify proof by client… ok
Reading data… error (9)
Done with Samsung Tool PRO v.27.1

Please help me out!