P1i flashing/rebrand

Is it possible to flash this phone some other way than seus!? If it is how to do it and witch program should I use? I need to flash my phone back to t-mobile croatia firmware because I have to take it back to service but I have debranded it and I dont have gdfs backup! Can somewone help me, and does anywone know where can I find croatian firmware??

and I meant if there is a free way to do this.........not with davinci or some other client.....help please:(