Note 5 EFS reset error


I am trying to reset efs then patch certificate then repair IMEI on NOTE 5. I keep getting the error (1) when trying to backup efs during reset efs operation.

What is causing this?

Below is the log:

Operation: Reset EFS
Selected model: SM-N920T
Software version: 23.9

Waiting ADB device… OK
Reading phone info…
Model: SM-N920T
Android version: 5.1.1
Product code: SM-N920TZWATMB
Phone version: N920TUVU2COI5
PDA version: N920TUVU2COI5
CSC version: N920TTMB2COI5
CSC country code: USA
CSC sales code: TMB
HW version: REV0.2
Phone S/N: RF8G729SGLH
Modem board: SHANNON333
RF cal date: 20150728
Checking Super user right… true
Backuping EFS… error (1)
Reseting EFS… error

Done with Samsung Tool PRO v.23.9

Thanks in advance,