Cannot flash anything on Note 4 N910F


Have just got a used Note 4. Trying to root it using (CF-Auto-Root-trlte-trltexx-smn910f). Cannot get Odin to flash it on the phone.
It seems like the phone somehow blocks flashing. This is what I get after each attempt:
On the phone
UDC Start

In Odin
<ID:0/003> FAIL! (Auth)
<OSM> All threads completed. (succeed 0 / failed 1)

The same happens with any md5 i am trying to flash (TWRP/Philz). Went through all available forums and could not find any solution.
Re-activation lock disabled as never signed in to Samsung.

Has anyone got any ideas on this please

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