How could i know my x10 region code?

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Hey!

I was just wondering how can i know my x10 region code? I bought my x10 from an online retailer and it is sim free & Unbranded.

my firmware is: Build number: R1FA014 But i cant update my firmware to the latest one, SEUS & pc companion always telling me that i have the latest firmware.

My model number is: x10i

Firmware version: 1.6

baseband version: 1.0.14

Kernel version 2.6.29-rel semc-android@SEMC #2

Build number: R1FA014

and knowing that my phone is sim free and im using my sim card , how can i be sure that it is fully debranded?

Where is the prb? how can i know my product code? or region code?

should i wait till april 26th date of release of new firmware from Sony Ericsson and maybe it will be an international update?

Hello, how do you know there will be an update on April the 26th ?

BR