Originally Posted by dautley

To apply any of the ICS leaks
!! WARNING: ONLY PROCEED WITH FULLY CHARGED BATTERY !!
1.) You must start with stock, unmodified 5.9.905 system. (Rooted is ok).
2.) Download the update onto your external sd-card.
3.) Power down your phone.
4.) Hold down both volume buttons, then press power button.
5.) Select recovery by pressing volume down then volume up.
6.) At the fancy logo press both volume buttons.
7.) Select "apply update" and then select the file downloaded in step 1 (Use vol up/down to navigate and power to select).
8.) Reboot.