You must have to rooted phone. And he is using 2.3.4 rom. 5830 orginal rom is froyo 2.2.1.
But you dont need to re-rom for this.
If you dont know how can you root ur phone, tell me i'ill help you.
Sent from my SG-ACE GTS-5830. Android 2.2.1 Froyo.XWKA9-rooted