First confirm that your phone is unlocked, ie try a Voda/Orange SIM in it and if it works just flash with Odin (which is what Kies does but without the user interface). No chance of bricking if you follow the instructions correctly.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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