u don't need to flash anythinh heres the R9 unlock patch this is the correct 1 for ur phone (attached).
1. get setool2 lite 1.08
2. select w300i from the drop down list
3. put the attached .vkp file in the MISC files box
4. press write script and now remove & reinsurt battery and connect ur phone holding down C
5. now just follow the instructions given by setool