Re-install program K550i

[kjerapong]

Can i reinstal firmware of K550i by myself?
How to install it?:
confused:

[BadBoyTC]

SonyEricsson Hardware and Firmware Definitions! - Top Sony Forums

Firmware has two parts:
1. FS: It contains languages, images, sounds, animations, settings, etc. Anything that isn't pure software.
2. Main: It contains the software.

You can download the MAIN and FS from this website, which you can flash on yourself using XS++ or setool 2 lite and some other apps.

Xs++:
XS++ 3.1 Guide-Flashing, Customizing, Recovering - Top Sony Forums

You'll need to read more tutoirals before starting off.