While i was surfing the net i found this official (and self-installing) ROM.
How to flash (PROCEDURE ONLY FOR XP):
-INSTALL THE DRIVERS IN ATTACHMENT
-Start the esecutable
-Select the CSC for your language (Spanish,Italian,French,Portuguese,German,Dutch,Greek,ENGLISH are ALL included in this rom)
-Connect your phone
-Click "Start Downloading"
-Wait until the phone reboots and configure the selected language
Impressions of this ROM:
-Improved battery life
-Improved phone functions
-Better audio quality
-Camera is still the same..
-Free ram about 40-50 MB after flashing
And here's the ROM (just unpack and launch): ROM DOWNLOAD
If you want to flash using Windows Vista/Seven,just tell me,i'll post the procedure.
Hope it will be useful,