Default [Q] Can't find network on Tab 3 7.0 3G (SM-T111

Hello everyone!
I have a problem with my brother's Tab. He had one of his friends root it and they installed a custom ROM. Then it stopped working and they asked me to fix it. I managed to reinstall the stock ROM and recovery, the only problem is the baseband. None of the firmwares I found on the internet come from an Italian device, so everytime he tries to make a call it says "Out of service area". The carrier is WIND.

So, how can I fix that? Should I go on an italian forum and ask someone to upload his baseband so I can flash it with ODIN or there's something else? 'cause I also thought about using Kies, but since it has 4.2.2 on it, it won't let me update it, since it's already at the last release available.

Thanks for your help, and please tell me if you need more informations.