.905 is the most current ota but you can flash an ICS leak which blow the doors off of GB. the most current leak is 6.7.235 but if something happens with that you will have a brick until an ICS FXZ file is released. I would flash the 6.7.232 leak because you can use the 5.9.905 fxz that you just flashed to fix any screw ups. since you are stock it is very easy to install an ICS leak. just download it, put it on your external sd card, boot into stock recovery and install it.
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