N920t unlock promble

peration: Unlock
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: N920TUVS2COKC
PDA version: N920TUVS2COKC
CSC version: N920TTMB2COKC
CSC country code: USA
CSC sales code: TMB
HW version: REV0.2
Phone S/N: RF8G71ZGYKX
Modem board: SHANNON333
RF cal date: 20150725
IMEI:
Checking Super user right… true
Initializating zTool… OK
Running zTool, please wait… error (7.7.8)

Done with Samsung Tool PRO v.23.9