my mistake kindly edit my unit is SM-J500FN 6.0.1

my mistake kindly edit my unit is SM-J500FN 6.0.1

solve via downgrade to 5.1.1
then root
then direct unlock
phone unlock

Please put the phone into Download Mode and connect USB cable.
To put SM-J500FN into Download Mode, You have to perform the
following steps:
1. Reconnect the battery.
2. Press and hold "Volume-" + "Home" + "Power ON" keys.
3. When phone turns on, press "Volume+" key.
Found phone on
Firmware write started.
Writing ABOOT section...
ABOOT section has been written successfully.
Writing SBL1 section...
SBL1 section has been written successfully.
Writing RPM section...
RPM section has been written successfully.
Writing QSEE section...
QSEE section has been written successfully.
Writing QHEE section...
QHEE section has been written successfully.
Writing APNHLOS section...
APNHLOS section has been written successfully.
Writing sec section...
sec section has been written successfully.
Writing BOOT section...
BOOT section has been written successfully.
Writing RECOVERY section...
RECOVERY section has been written successfully.
Writing SYSTEM section...
SYSTEM section has been written successfully.
Writing MODEM section...
MODEM section has been written successfully.
Writing CACHE section...
-----------------------------------------------------------------------------------
Platform: Samsung Android
Selected port: COM98
Selected model: SM-J500FN
Detected phone model: SM-J500FN
Firmware compiled date: Mon Jul 6 14:22:31 KST 2015
PDA version: J500FNXXU1AOG1
CSC version: unknown
SW version: J500FNXXU1AOG1
Phone SN: RV8H21J490P
Android version: 5.1.1 (LMY48B)
Sales code: unknown
Country: unknown
HW platform: msm8916
HW Chip: MSM8916
HW Modem: MSM8916
Codename: j5nltexx
Checking Root:
Phone is Rooted.
Unlocking phone...
Phone is successfully unlocked
To finish the operation, please restart the phone via phone's menu.
Performed by 2.4.2 Software version.


problem solved..