Unfortunately neither of these would boot on a device which previously had ice cream sandwich installed. SuperR took that nandroid and made a flashable debloated, rooted, de-odexed zip. It started with Shinru2004 and his nandroid dump of a Sprint 4.1.2 Force 4g. Well it has been a long time coming but we finally have a working Jelly Bean 4.1.2 ROM that can be flashed onto the ICS phones!