SE Z550i some Q ?

[k_blues24]

I want secret codes for that SE Z550i phone,
also want to know that can it's firmware be updated with some other SE Model?
How can I compose my own melody for this phone?
thanks.

[krazyfrog]

1: There aren't many 'secret' codes for SE phones as there are for Nokia phones but you can google them.
2: No you can't upgrade its firmware with that of any other model.
3: Use the MusicDJ feature in your phone to compose your own melody.