samsung j400f root done by great eft 8.0.0
EASY-TEAM
Waiting For Android Device.......OK
Reading Device Info.......OK
Product: samsung
Device Chipset: samsungexynos7570
Device Model: SM-J400F
Device Serial: RV8K7105C7N
Android Version: 8.0.0
Android SDK: 26
Architecture: armeabi-v7a
Free space in system disk: 170M
Phone Mode: Normal Mode
Checking Root Permission.......OK