The results are in....
The Code had been already used.
To anyone wondering what the code is: 6XC9-G591-180N-W149.
I contacted my friend right after entering the code, and he told me that his codes work just fine. He proved it by generating a new code, entering it on the Eshop, and yes, the code worked. So I asked him where he downloaded this wonder-program. And guess what, his older brother gave him the software, and his brother is out of town for the next few weeks. I asked him to contact his brother, and told him to tell his brother that 50+ people were waiting for an answer. Let's keep each other updated.