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That's what I thought and I didn't back them up. Is it possible to take the keys from the same model of phone and flash them onto the phone without the keys? I did send my phone to sony for repair at my cost but when it returned without charge and saying fixed I was a bit dubious. I checked the phone and it was exactly the same as it was when I sent it off, no camera functions, no mirrorlink, all things connected with DRM keys still not working!
Why don't you just google search with "restoring image quality xperia u" and find something in XDA forum.
#This talk.sonymobile doesn't allow us to post direct link directly.