For now I don't know about a way to root without Pc.
You can look here:
http://xdaforums.com/galaxy-j5/how-to/tutorial-upgrade-j5-2015-to-6-0-t3443904
a downgrade solution. Maybe Kingroot is able to root it afterwards.
When unsuccessful you will at least be able to flash twrp via Odin and flash SuperSu zip(Google for it).
Look here:
http://xdaforums.com/galaxy-j5/development/recovery-samsung-galaxy-j5-t3338869
Much fun
For now I don't know about a way to root without Pc.
You can look here:
http://xdaforums.com/galaxy-j5/how-to/tutorial-upgrade-j5-2015-to-6-0-t3443904
a downgrade solution. Maybe Kingroot is able to root it afterwards.
When unsuccessful you will at least be able to flash twrp via Odin and flash SuperSu zip(Google for it).
Look here:
http://xdaforums.com/galaxy-j5/development/recovery-samsung-galaxy-j5-t3338869
Much fun