Thanks simox..
Like I said it isn't a big deal..and I rather have an unlocked phone than this backup feature...I might try what you said...
BTW The main is the generic, and the FS is the default one that came with the phone (Australia, I think is Europe 2 FS though)..
Possibly the reason why it fails cos the mixed firmware (like you said).
If you figure out the actual reason, then let me know thanks..