The Galaxy S I9000 gets its latest Jelly Bean update, Android 4.1.2, through CyanogenMod 10 (CM10) Final ROM release. The ROM based on AOSP custom ROM brings stock Android experience to the user, along with a number of exciting new features and system tweaks. The installation of this ROM requires ClockworkMod Recovery (CWM) to be pre-installed on the phone. Key Points to Note The CM10 Final ROM and the instructions provided in this guide are applicable only to the international variant Galaxy S I9000 model and will not work on any other device. Verify your device's model number by navigating to Settings &gt; About Phone. Do a Dalvik Cache wipe before continuing from the recovery mode. Samsung KIES will not recognise your phone after installing the Android 4.1.2 CM10 Jelly Bean ROM, as it is a custom ROM release. The ROM is not an official firmware update, but rather a custom ROM based on AOSP release of the Android 4.1 Jelly Bean. The instructions provided in this guide are meant for reference purposes only and do not cover any warranty claims involving device damage or issues arising out of using the Android 4.1.2 CM10 firmware update. Users are cautioned to proceed at their own risk. Step 8 - Use volume keys to browse to the Android 4.1.2 ROM zip file that you copied to your phone's SD card, and select it by tapping the Power button . Confirm the ROM installation on next screen and the installation procedure should begin.