[Q] How to fix 3G on MTK6575 based chinese phone

Hi guys, I've recently bought a Star v12 chinese android phone.
Full specs here:

Quote:

Features:
The MTK third-generation high-speed processing chip,
MT6575-1GHZ system,
4.3"QHD screen,540x960 pixels,
High-definition video HDMI output,Equipped with Android 4.0.3 OS,
WCDMA/GSM,four-bands ,Mobile AP,wifi,GPS+AGPS,
Light sensor,Gravity Sensor,Proximity sensor,Digital compass,
5MP AF+0.3MP front camera,flash light,
1700 mAh lithium ion battery

Star V12 Dual-core MTK6575 1GHz 4.3 inch 960*540 resolution HDMI 6575 Andrews 4.03 os 800 million pixels WCDMA 3G iSTAR V12 smartphone
Ultra-thin PDA Smartphone(Android 4.0.3 OS)
Specification
Screen Size: 4.3" Capacitive touch screen, 5 point multi-touch
Display reulotion: FWVGA screen, 960*540
Color Support: 16 million colors
Screen Technology: Multi-touch Screen
Camera
Camera Resulotion: 8.0MP or 5.0 MP back camera, 0.3MP front camera
Connectivity
Connectivity Technology: GSM & 3G WCDMA network
Network Band: GSM 850/900/1800/1900 MHz & 3G WCDMA 2100 MHz
Data Technology: GPRS, HSPDA
Bluetooth: Bluetooth 2.1
WLan: Wi-Fi IEEE 802.11 b/g/a
USB: USB 2.0
GPS: GPS / A-GPS
Features
Video Player: AVI MP4 3GP MOV MKV FLV
Audio Player: FLAC APE MP3 OGG AMR AAC
Image: JPG PNG BMP GIF
Ringing Tones: Downloadable
Message: SMS, MMS, Email
Phone Book: More than 10000 contacts
Brower: HTML
Game: Downloadable, Google Market
Radio: FM Radio
G-sensor: Yes
Interface/Port: 3.5mm earphone jack / mini USB
Battery
Battery: Built-in Li-on battery, 2000mAh
dby Time: 180-240Hours
Memory
Built-in Memory: 4GB ROM / 512MB RAM,
Memory Card: support to extend TF card to 32GB maximally
Dimensions: 128.2x65.8x12mm
Weight: 150g
Multi-language: English, French, Italian, Deutsch, Spanish, Portuguese, Russian, Indonesian, Turkey, and more

I had to do some tweakings to the phone (fixing imei numbers and SMSC) and all that works just fine. The problem I have now is that I can't use 3G network.
I live in Argentina and my carrier is Movistar.
All I could find is that maybe the baseband is wrong (I checked before purchasing the phone and they seemed right) so I have to change it.
I had 3G with my previous phone, a Xperia X8 with minicm9.
If there is any information you need to adress properly the problem, I'll be glad to give it.
Thank you

R.

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