Bricked(?) trying to change CSC

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http://forum.xda-developers.com – My phone was purchased in Ireland (CSC VDI, Vodafone) but at some point (do not ask me when and how) I somehow managed to change to code to some British BTU. Now, I wanted it back as VDI. 1.Tried to do the trick with *#272*IMEI# - no luck, unknown application (reply to USSD code). 2. Tried to use the Samsung CSC android app - in root mode it only factory resets the phone but leaves the code BTU. Even factory reset from the recovery mode does not help. 3. As the last resort, downloaded the full firmware Samsung-Updates.com-GT-I9300-VDI-I9300XXELLA-1356163678.zip (used for VDI) and uploaded u (HowTos)