SM-G925F Galaxy S6 Edge

I need help while writing cert to S6 Edge, could someone help me ? Downgrade modem is not possible…

Operation: Write CERT
Selected model: SM-G925F
Software version: 26.0

Waiting ADB device… OK
Reading phone info…
Model: SM-G925F
Android version: 6.0.1
Product code:
Phone version: G925FXXU4DPG4
PDA version: G925FXXU4DPG8
CSC version: G925FPHN4DPG1
CSC country code: The Netherlands
CSC sales code: PHN
HW version:
Phone S/N:
Modem board: SHANNON333
RF cal date:
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… error (9)

Done with Samsung Tool PRO v.26.0