Read Cert error G935f

Operation: Read CERT
Selected model: SM-G935F
Software version: 26.0

Waiting ADB device… OK
Reading phone info…
Model: SM-G935F
Android version: 6.0.1
Product code: SM-G935FZKAVIA
Phone version: G935FXXU1APD1
PDA version: G935FXXU1APDH
CSC version: G935FTEF1APC2
CSC country code: Germany
CSC sales code: VIA
HW version: MP 0.801
Phone S/N: RF8H30CA8SJ
Modem board: SHANNON335
RF cal date: 20160304
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: EC 55 50 D6 FA 5E 15 C8 94 E3 6D 22 99 33 C1 22
Reading nv data… error

Done with Samsung Tool PRO v.26.0 :mad::mad::mad: