if u are not able to do it den try dis
Prepare your phone by doing the following:
- Go to Settings > Applications > CHECK "Unknown Sources"
- Go to Settings > Applications > Developer > CHECK "USB Debugging" and "Stay Awake"
- Connect your phone via USB, when prompted DO NOT select USB Mass Storage.
- Extract FXX_PR3_NV.xml and NvDefinition.xml from the attached zip file in to a folder
- Now, install SUT LR, run the app
- Select the FXX_PR3_NV.xml [ensure NvDefinition.xml is also in the same folder as FXX_PR3_NV.xml]
- Your phone will restart.
It does NOT erase anything on the phone, since it only patches the ROM.
then install unlock root open it and select root it will take less than 3mins to root it.
(keep ur cellphone in USB debugging mode)