g910f unlock problem

Code:

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Selected model: SM-N910F

Selected port: COM4 Z3X BOX Serial Port

Selected port speed: 115200

Checking certificate file... OK

Searching ADB device... OK

Reading phone info...

Model: SM-N910F

Android version: 4.4.4

Product code: SM-N910FZKEFTM

Phone version: N910FXXU1ANK4

PDA version: N910FXXU1ANK4

CSC version: N910FFTM1ANK1

IMEI:

Phone S/N:

Checking Super user right... true

Bypass MSL... error

First do Wipe EFS

Done with Samsung Tool v.19.1

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how to solve this problem

thx

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