Fix failed mount efs
First flash combination
Device will boot up in black screen with adb enable
Run KINGOROOT or any root app
And make root for it
Now on any tool or box just make reset efs
For my experince i used Z3X and select J700H and from repaire and make RESET EFS
now flash stock rom 4 files
Now we will have DRK PROBLEM
just flash cf auto root
Done