SM-A510F Writing DRK... error [Checking]

Hi
A510FXXS5CRA1 have drk issue and i try to repair it with z3x,not done

i want to fix original drk , not root or boot combination any custom rom or .....





Operation: Repair DRK
Selected model: SM-A510FD
Software version: 33.5

Checking local file... OK
Searching server... OK
Compare local and server file... OK (up to date)
Searching USB Flash interface... COM14 detected
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...
Recovery build version: 6.0.1
Boot version: A510FXXS5CRA1
Platform: exynos7580
Boot serial: 33001fad1b0793a3
Product board: a5xelte
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Checking DRK status... NG!
Writing DRK... error ()