Question Canīt use odin +_+

Hello guys!

I want some help/advice from you.

Here is the problem:

Some time ago I rooted my phone and tried a few things with root access.

Then few days ago, my carrier released the 4.4.2 OTA update and I wanted to install it.
My wifeīs cell has the same model as myself and she could do the update. Then I used the SuperSU

option to "unroot". I tried to update again via OTA but it was no use.

Then I googled that I have to use the "triangle away" app to reset the counter. I tried to follow

the steps but everytime I get to connect my phone on the pc to use Odin, the program wonīt

recognize it when my phone is on download mode even if I change the usb ports...

So...could you help me?? Thanks