Need help! Unlock Samsung S3 Mini

Thank you in advance to anyone taking the time to read this and help.
This is my absolute last resort as I'm normally pretty tech-savvy and able to do things like this after a few attempts but something just isn't going right.

Basically i'm trying to unlock my phone and I found this guide: [TUTORIAL] Unlock Samsung [GT-S5570 / i5500 / Galaxy Ace]

Now I don't understand what the issue here is, whether the guide is missing...

Need help! Unlock Samsung S3 Mini

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