Odin Flash Fail - Firmware Update

Hi,

I am trying to flash firmware BOG2 over BOC1 and I am consistently getting flash fail with the below error message.
I have changed the USB cable/port as well nothing works?Any help:confused::confused:

<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> R750XXU2BOG2_R750OXA2BOG2_R750XXU2BOG2_HOME.tar.md 5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/007> Odin v.3 engine (ID:7)..
<ID:0/007> File analysis..
<ID:0/007> SetupConnection..
<ID:0/007> Initialzation..
<ID:0/007> Get PIT for mapping..
<ID:0/007> Firmware update start..
<ID:0/007> SingleDownload.
<ID:0/007> dzImage
<ID:0/007> NAND Write Start!!
<ID:0/007> dzImage-recovery
<ID:0/007> sbl1.mbn
<ID:0/007> FAIL! (Auth)
<ID:0/007>
<ID:0/007> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)
<ID:0/007> Removed!!
<ID:0/007> Added!!
<ID:0/007> Removed!!