Disclaimer: Tested on 1.8.3 using sbf_flash and RSDLITE 5.3.1, usual warnings being responsible for your own actions yada yada
YOU WILL LOSE ALL FILES IN /DATA backup is your friend.
Prepare: If you're in windows land you will need to re-install drivers. Thanks for the link.
If Titanium Backup destroyed your Fingerprint Scanner settings try...
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