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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 v22.214.171.124 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 v126.96.36.199 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.
Step 1. Download the appropriate CWM Recovery ZIP file for your Galaxy S2 GT-i9100 or SGH-i777. (If for some reason you do not have a custom recovery installed already on your phone, you can also grab the TAR version and flash it using ODIN.)
Put the ZIP file on your phone and also put the Android 4.4 KitKat ROM you want to install on your phone.
Power off your phone and reboot into your recovery by holding down Volume Up, Center Home, and Power buttons together for about 20 seconds.
Step 2. Once in recovery, choose “install zip” for CWM or choose “Install” for TWRP and browse your file system to install the ZIP file you downloaded earlier.
*Note – If you see CWM Recovery v188.8.131.52 or higher at this point, you may skip to Step 4.
Step 3. Once done installing, simply reboot into recovery using the advanced menu or you can also do it manually like you did in Step 1.
Step 4. Once rebooted, your should see CWM Recovery v184.108.40.206 or higher. If you see that, you are good to go, just do a regular ROM install from there on in. If you have trouble, watch our video tutorial above which walks you through a ROM install.
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