IOS 5 new hash for sync music

Hi,

Before update my iPhone in IOS5 i used sync with rhythmbox.
Now doesn't work because a lot of changes on IOS5 for sync music :(

This week i discovered libgpod source code.
I wish to understand how work synchronizing between iphone(IOS5) and 
libgpod.
So i had open database (iTunes_Control/iTunes/MediaLibrary.sqlitedb) and 
i have seen a multiple hash code entries.
He seems that it is hard for solve it.

Currently, have you any runway for resolve new hash?
A model of itunes DB, is it different between IOS 4 and 5?
Have you got a name of tools and tips for decode/simulate hash?

Thank you for reading,
nfk

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