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For those of you who want to install Android KitKat or Lollipop custom ROMs on your Galaxy S2 GT-i9100 or SGH-i777 (AT&T S2), you must be using latest CWM Recovery v126.96.36.199 or higher.
This method is also same for CM11, CM12, and CM12.1 custom ROMs.
Now since recovery is an integral part of kernel on the Galaxy S2 GT-i9100 and SGH-i777, you will have to flash a kernel with the latest CWM recovery v188.8.131.52 or higher. The easy work-around this is to install any of latest CM10.2 ROMs then simply reboot into recovery after installing CM10.2, which will give you the latest CWM recovery since CM10.2 comes with it.
But I have made things even easier so you don’t have to spend a long time installing CM10.2, you can simply install CM10.2 kernel by using the zip files below. I highly suggest to keep these files on your phone at all times so you will always have it to flash new Android 4.4 KitKat custom ROMs.