Here is the Official WT19i 4.1.B.0.587 ftf file
Alternate Download Link
Thanks to lobo115
After downloading extract using WINRAR
I have tested this ftf on my LWW it is working good.
Games are now working fast and smooth... same as GB
Rom is much more smoother and faster
Dialer is pretty faster
Camera is faster
Better video recording
New base-band 77
New base-band is faster in response
Some what less battery drain than previous .431
Better RAM usage
Some more minor changes.....
***LED is working for only call!!
For getting root access try this method (if you have unlocked bootloader)