Problem with my xperia e4 dual from Argentina

[hernancalo]

Hello, I AM from Argentina,  few days ago I received my sony xperia dual e4 from Italy. Free unlocked since I put sim card never achieve connect me to 3g networks. what is the problem? I expect a firmware for my country? or I can install any generic? what are the steps?
Thank you, I expect a prompt response

[Uliwooly]

Your phone it's not compatible with your networks 3G bands

[Uliwooly]

HSDPA 850 / 1900 / 2100 - E2104

HSDPA 900 / 2100 - E2105

[Uliwooly]

Settings, about phone, which version do you have? Which network do you have?

[hernancalo]

850/1900 network

and my model of the phone is E2115 dual

so i dont have solution?

[hernancalo]

in the page that i bought figure this:

SIM 1: UMTS HSPA+ 900 (Band VIII), 2100 (Band I) MHz GSM GPRS/EDGE 850, 900, 1800, 1900 MHz SIM 2: GSM GPRS/EDGE 850, 900, 1800, 1900 MHz 

so if i put the card sim in the slot 2, i have 3g and nothing only works in 2g 

[Uliwooly]

As you can see you will get 2G but never 3G.

[hernancalo]

but why??

if a download a new firmware i dont fix these problem?

why never get 3g with this phone?

im sorry but i dont understand how it works

[hernancalo]

can anyone help me?

i dont have any solutions?

the flashtools program have the drivers of these phone?

[Uliwooly]

@hernancalo 

It's a hardware limiation, you can download firmware from another variant of the phone, but it won't change a thing, you can't change the 3G frequencies. you have 2 options

1. use the phone as is without 3G

or

2. return it and get a new phone that is compatible with your network

side note, Sony isn't the only company that has variants on their phones, even the iphone has different versions for different regions/networks.