hi guys i have a problem with the smart phone, hope you can help
Ok.
a friend of mine brought to me Samsung galaxy s2 i9001 with the unknown baseband , i decided to to post it in here
First thing to try is just to load the correct modem to the phone for the firmware it currently has. If it has a custom rom, then would be best just to just to restock the thing with Odin. You'll find tons of info here:
There's a section called Rom Parts that has a collection of modems to use, depending on the region the phone is originally from. The wiki has all the links to the Odin version you need, drivers, guides, etc.