Samsung release Preroot firmware for there few device, till we found and tested Galaxy Star Dual sim, Galaxy S4.
We know you how to install preroot firmware by below steps:
1. Need ODiN (Download- Odin3 V1.85 http://depositfiles.com/files/qr73xo3dk)
2. Need Preroot firmware (Download- PREROOTED_FIRMWARE.zip)
3. Turn off your device and go to Download mode (By press Home+Volume down+Power button.)
4. Connect you device to pc
5. Run odin 3.07 (or higher)
6. Click on PDA and select “pre_rooted_system.tar” (or correct file define by model)
7. Click on Start button and wait until finish and see the “pass” in green box on Odin, Phone will be automatic reboot after this.
Now phone is origin root.