SM-925A cert writing problem

Waiting ADB device… OK
Reading phone info…
Model: SAMSUNG-SM-G925A
Android version: 5.1.1
Product code:
Phone version: G925AUCU3BOI2
PDA version: G925AUCU3BOJ7
CSC version:
CSC country code:
CSC sales code:
HW version:
Phone S/N:
Modem board: SHANNON333
RF cal date:
IMEI:
Checking Super user right… true
Initializating zTool… OK
Running zTool, please wait…
Start… OK
Init… OK
Generate and check client proof… OK
Verify proof by client… OK
Reading data… OK
HWID: 88 59 97 EF 57 07 00 00 00 00 00 00 00 00 00 00
Checking certificate file… OK
KEY ID: 0346
Reading nv data… OK
Checking NV data… error
Security damaged (1)
Done with Samsung Tool PRO v.26.2