XS++ 2.x Guide

[ts013]

waytozion: Why don't you have a look for yourself? Downloads - K770 - Top Sony Forums R8AB001_RED52-->TMobile Int A/B, R8AA018_RED52-->Vodafone 3
Have a look at the languages description to find out wether this is the firmware you need. You can find it on the mainsite.
Regarding the warranty: Well, you void your warranty as soon as you flash different firmware to your phone but the service centers usually don't find out if you flash the original firmware back to the phone.

Carfreak: You can also connect the phone to XS++, maybe it will ask you if you want to upgrade to CID52. There's a script you can use with XS++ to upgrade. If your phone has been upgraded before you can't upgrade it another time.

[Kris18]

Why XS++ 2.2 it lacks CDA for k550?