My seem is decrypted. Here is my instruction:
1. We change phone seem 01C4_0001 by my seem 0371_0001.
2. We power down phone.
3. In flash mode we make backup of PDS.
4. We extract binary file of PDS from FlashBackup file.
5. We parse PDS in PDS Tool.
6. We copy SEEM 01C4 into 0371.
7. We copy SEEM 01C3 into 01C4. (01C3 = 01C4 always i think)
8. We assemble PDS 4009 in PDS Tool from these SEEMS
9. We change version of PDS to 4013 in HexEditor.
10. We restore that created PDS into phone.
11. We are using iTunes!!!!

People. I have made working iTunes. Whole secret exists in PDS SEEM 0371.
I can give photos of my work... We need just to add one encrypted seem 0371 into PDS.
I've added right SEEM 0371 content.

And iTunes files must be these from ROKR flexes (like that from 42R monster pack).

Sorry for english, translate please...