Have you tried booting into the Recovery Mode ?
# Power Off the '''Galaxy Note 5''' (if you cant remove battery then put back on)
# Press and Hold the Power Button, Home Button and the Volume Up Button at the Same Time.
# Continue Holding These Buttons Until You See Some Blue Text at the Top of the Screen.
# When You See the Text ''''Recovery''' Booting', Then You Can Let Go of These Three Buttons.
# tried factory resetting your phone