n920c repair drk fail


pl help

why cant repair this phone?:(

Operation: Repair DRK
Selected model: SM-N920C
Software version: 26.2
Checking local file… OK
Searching server… OK
Compare local and server file… OK (up to date)
Searching USB Flash Interface… detected COM4
Setup connection… OK
Reading data from phone… OK
Sending data to phone… OK
Sending data to phone… OK
Waiting ADB device… OK
Reading phone info…
Android version: 6.0.1
Boot version: N920CXXU2AOK6
Platform: exynos7420
Boot serial: 832e493733455444
Product board: zenlte
Initializating zTool… OK
Running zTool, please wait…
Start… OK
Init… OK
Generate and check client proof… OK
Verify proof by client… OK
Checking DRK status… NG!
Writing DRK… error (error(5.6.-13))
Done with Samsung Tool PRO v.26.2

tks z3x team