First of all you must to think if you must to do this!!!
After flashing in your tel is addet only Walkman 2.0 and Flash Lite 1.1 suporting.

An second step your must to check you mobile version >*<<*<*
Now your must download correct FS for you langvich and Main pack GENERIC also you must
download CUSTOMISE pack for your mobile operator.

Now you can flash with XS++ or SETool2 Lite or Far Manager
Good luck!