Saw this on Android Central and haven't been able to try it yet, let me know if anyone gets it too work...
The mystery has been solved reboot your phone in safe mode by turning it on while holding ok until R2 goes away it should say safe mode in a corner and start downloading. fyi when it restarts after installing r2 stays on for an extremely long amount of time let him sit and spin if it takes longer than an hour than go ahead and restart. it should start up on its own
-dashadow5808 on Android Central