well buddy i hv posted the links of tutorial for k550i to w610i !!

hey there AFAIK u don't loose much
cam won't start automatically when u open shutter u must start from main menu or use cam button to do so..

and the left softkey will be set to walkman player instead of internet browser !

and you loose the hopeless media player that comes with k550i ! ;)

u can google search flashing k550i to w610i and the top result is an amazing and an easy tutorial to follow !

camera won't take any beating !!! it will remain same !!