I have a Samsung Galaxy S3 (SGH-I747 for AT&T) that is not rooted. Recently it started shutting down in the middle of use and not start up again. At first, plugging it into the charger would get it to boot up and work. But after a few days it progressed to the point that it does not boot up at all anymore. I can get it into Recovery Mode and Download Mode but nothing else. Before I proceed further in trying to fix the phone, is there a way to backup the data -- mainly pictures and sound recordings? (No, it did not have an sdcard installed. And yes, I know it should have.)
I have never worked with this type of thing before (rooting, CWM, ADB, etc), but I have a remedial understanding of programming and I'm willing to get my hands dirty, as long as the instructions are clear. So please answer as if I have no idea what you're talking about (which most likely I don't).
Based on my preliminary research on this site and elsewhere, ideally I would make both a Nandroid backup and an ADB backup. I read that the ADB backup requires USB Debugging to be enabled. But if the phone won't turn on, that can't be done, right? Or is there a way to enable USB Debugging from recovery/download mode? I am assuming it can't be done and that the ADB option is out.
That leaves making a Nandroid backup. If I understand the procedure correctly, I need to download USB drivers, Odin, and ClockworkMod onto my PC, then install CWM onto the phone. From there, use CWM to make a backup onto an external sdcard. Once the phone is fixed, root it, install Titanium backup, and use Titanium to extract the data from the backup. Does that sound right? Would this work?