When my phone is in download mode it doesn't connect to computer

[PabiGamito]

I am trying to unroot my phone. But when I put my phone in download mode and then connect it to the computer with the original samsung cable, it doesn't connect. But the odin COM box turns blue. Then I add the PDA and it buffers. When it stop loading I click on start and the it just says FAIL! in big letters and the box at the top left becomes red.

I can't find why this is happening, since it connects properly when not in download mode. Is there another way I can do it? Or am I doing something wrong?

I have rooted it when my phone was at 4.2.2 and I am trying to add the 4.3 firmware. I know this is a bit far fetched but could it maybe be a problem?

Thank you.


This is what I get in Odin:
<ID:0/005> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> N9005XXUBMJ3_N9005OXXBMJ3_N9005XXUBMJ2_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/005> Odin v.3 engine (ID:5)..
<ID:0/005> File analysis..
<ID:0/005> SetupConnection..
<ID:0/005> Initialzation..
<ID:0/005> Get PIT for mapping..
<ID:0/005> Firmware update start..
<ID:0/005> sbl1.mbn
<ID:0/005> NAND Write Start!!
<ID:0/005> FAIL! (Auth)
<OSM> All threads completed. (succeed 0 / failed 1)

 

[PabiGamito]

Apparently is wasn't as far fetched as I though because that was the problem I had to use 4.2.2 firmware instead of 4.3.