think You might need to add this info.
i couldnt root my j500fn, all the time got fail (auth).
after reading about it i found out that OEM is off in some phones and actually was in mine.
please activate developer options to Allow the device to be OEM unlocked.
that will turn off the safety software what is blocking the root.
go to settings/about device(on the bottom of settings)/software info/and press 8 times on build number.
that will unlock developer options.
go back 2 times to settings again and u have before "about device" now option to developer options, go in and turn on OEM unlock. u will need to confir it. i add as well usb debugging just in case.
turn off ur phone and try again, im sure it will work.
nexus is the only phones that OEM unlock is active from factory.
hope that helps....it helped me a lot.
TWRP Recovery for Samsung Galaxy J5.
DISCLAIMER:
Code:
Your warranty is now void.
I'm not responsible for bricked devices, dead SD cards,
thermonuclear war, or you getting fired, because the alarm app failed. Please
do some research if you have any concerns about features included
before flashing it! YOU are choosing to make these modifications, and if
you point the finger at me for messing up your device, I will laugh at you.
INSTRUCTIONS:
1.Download and install Odin,usb drivers.
2.Power off the device and boot into download mode by holding [VOLUME DOWN/HOME & POWER].
3.A Warning screen appears,now press volume up once and connect the phone to the PC.
4.Open Odin with admin rights and you should see the phone added at some ID COM: port if not then you have to download and install the appropriate drivers.
5.Now click on AP and select the downloaded recovery file.
6.Hit start and the flashing will be done in a few seconds and the device reboots.
7.Hold VOLUME UP+POWER+HOME buttons to boot into recovery.
Enjoy!!
This should work on all J5 variants running on official stock Marshmallow without any issue.Test and report back so that your variant can be added to the supported device list..
TWRP DOWNLOAD UNIFIED(3.1.0-0)
TWRP
Old Downloads(3.0.2-0)
Mirror(Google Drive) :
Old Downloads
Please provide a link of this thread over your blogs instead of the direct download link.
NOTE : For some reasons twrp gets replaced back with the stock recovery if we left the device to reboot into system after flashing. To overcome this issue untick the
Auto Reboot from the options in Odin and flash the recovery by following the above steps. Now right after flashing is done,power off the device and power it on by holding
[ VOLUME UP+HOME+POWER] to enter into the recovery and
'swipe to allow modifications'.
Be careful while backing up and playing around with efs partition,you might loose your IMEI.!!
BUGS :
You tell me!!
Sources & INFO :
Recovery Kernel : 3.10.x
Created : 12-07-2016
Last Updated : 28-07-2016
Status : stable
Sources : Github J5 Organization
CM13 under development 
Changelog:
----------------------------------------------------------------------------------------------------------------------------------------------------
Code:
September 27,2016:-
- Added separate recoveries for each variant.
July 28, 2016:-
- Fixed mtp.
- Removed mouse cursor.
- Updated kernel source to caf.
July 12, 2016:-
- Initial release.
----------------------------------------------------------------------------------------------------------------------------------------------------
Contributors :
@Nick Verse
@jackeagle
@ganesh varma
XDA:DevDB Information
TWRP-3.0.2-0 , Tool/Utility for the Samsung Galaxy J5
Contributors
ganesh varma,
Nick Verse
Version Information
Status: Stable
Stable Release Date: 2016-07-28
Created 2016-11-06
Last Updated 2017-05-30
