In Progress [2.6.1] {GT-i9100} 3g not working!

[flookkung555]

I'm in thailand the miui 2.6.1 can't use the 3g on 850 Mhz.How to fix it.
Sorry for my bad english.
Thank you verry much.

 

[iBotPeaches]

Is that even a 3G baseband?

 

[flookkung555]

yes .Are you know how to fix it .