I just restored my iPhone 5 from 6.1.2 JB to 6.1.3. No hassle. I saw threads on people have boot problem after restore in iTunes on their device. So I though it could have been a tweaks file in a backup of some sort so I ran iLEX R.A.T before restoring so I can get rid of the JB as much as I can before I backup and restore.
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