How to Install Android 4.2.1 Jelly Bean on Galaxy Nexus I9250 with JPO40D Xylon Custom ROM
Step 2 - Connect and mount your Galaxy Nexus USB mass storage on your computer with original USB cable.
Step 3 - Copy and paste the Xylon ROM and Google Apps zip files to the root folder on your phone’s SD card.
Step 4 - Then power off your phone and boot into Bootloader mode.
Step 5 - Switch on the phone while pressing and holding Volume Up, Volume Down and Power buttons together until the device enters Bootloader mode
Step 6 - Follow the navigational instructions on screen. Now, select Bootloader and progress into Recovery.
Step 7 - In ClockworkMod recovery (CWM), wipe data first. Then navigate to Flash zip from SD card option and hit Power button to select it.
Step 8 - Tap the Power button again and click Choose zip from sdcard.
Step 9 - Use volume keys to navigate to Xylon ROM zip file and select it by tapping Power button. Confirm the ROM installation on next screen and the installation procedure will begin.
NOTE: Repeat this step for installing Google Apps as well.
Step 10 - Once Google Apps is installed, hit Go Back and reboot the phone by tapping Reboot System Now in the Recovery Menu. The phone will reboot and the first boot might take about 5 minutes to complete. So, leave it alone.
Android 4.2.1 JPO40D Xylon custom Jelly Bean ROM is now installed on your Galaxy Nexus I9250. Go to Settings About Phone to verify the firmware version installed.
[Source: Team Android]
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