Root Please Help: Samsung Galaxy Note 8 Rooting Problem

[JohnBell5713]

Hi,

I'm trying to root a new Samsung Galaxy Note 8 GT-N5120 using the guide at:

Root & CWM for Galaxy Note 8.0 GT-N5100, GT-N5110 & GT-N5120

Odin 3 failed with the following dialog:

<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> CF-Auto-Root-konalte-konaltexx-gtn5120.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/003> Odin v.3 engine (ID:3)..
<ID:0/003> File analysis..
<ID:0/003> SetupConnection..
<ID:0/003> Can't open the serial(COM) port.
<OSM> All threads completed. (succeed 0 / failed 1)

Note that the ID Com box shows 0: [COM3]

I suspect that the error is mine - I neglected to turn on USB Debugging.

Is this situation recoverable, or have I bricked my tablet?

John