[Upgrading, Modifying and Unlocking] emidesja:
How to install custom ROM

For LG Optimus Chic (E720)

Please note that I do not assume any responsibility in case of brick or malfunction of your device! Do it at your own risk!

Step 1: Rooting your device

Root your device using an app like Z4Root to permanently give root access to the Optimus.

•	Go to http://xdaforums.com/showthread.php?t=833953 and download the .apk

•	Allow unknown sources to install apps on your devices (done by going to Settings - Applications)

•	Install Z4Root

•	Once it’s install, open the app from the Launcher and chose Permanent Root.

•	Once Z4Root has done, your phone will reboot and you should have the SuperUser app installed

•	To check that you really have root access you can install Terminal Emulator form the Play Store as we’ll need it after. https://play.google.com/store/apps/details?id=jackpal.androidterm&hl=fr

•	After you’ve install it, open a terminal session and you should see a «$». Just type ‘’su’’ and a window will open prompting you to allow super user. Chose «Allow». You will notice that the «$» had changed for a «#» this meaning that you have rooted your Android device !

Step 2: Install a custom recovery

In order to have a custom ROM, we will need a recovery to flash the .zip to the phone

•	Download the recovery image and the flash_image by going to http://xdaforums.com/showthread.php?t=1046135

•	Once both files are downloaded, unzip them on the root of your SD card.

•	After that, form the Terminal Emulator or an ADB Shell type the following commands in order to install the custom recovery.

su

mount -o remount,rw -t yaffs2 /dev/block/mtdblock1 /system

cat /sdcard/flash_image > /system/bin/flash_image

chmod 0755 /system/bin/flash_image

mv /system/etc/install-recovery.sh /system/etc/install-recovery.sh.bak (notice this file install-recovery.sh may not be on your device if it gives an error or file not found move on)

flash_image recovery /sdcard/recovery-alessi-gnm.img

sync

•	Power off your phone and boot in recovery mode by holding the Vol+ , Vol- and Power until you see the recovery on the screen.

•	The message «E: bad boot» is normal. It will show up for everyone.

•	You now have a custom recovery installed. It’s now time for the ROM itself!

Step 3: Installing the ROM

To make sure if anything go wrong, please do a nandbackup by going to Backup/Restore on the recovery before proceeding.

•	First of all you got to find the right ROM for you. I choose a nighty version of CM7 because it’s light, fast and easy to find not like a CM9 ROM. You can download it form http://get.cm/?device=e720

•	Because this ROM don’t have Gapps (Goolgle Apps) in it, we will download it to have the Play Store working on our device. http://goo.im/gapps/gapps-gb-20110828-signed.zip

•	Once all of the files are copied on the root of the SD card (Make sure you haven’t unzip them!) boot into recovery mode and perform a wipe of your device.

•	After, flash the ROM on the device and after the GApps.

•	When everything is done, you can proceed in the process of rebooting.

•	Take note that the first boot after you have flashed a ROM may take WAY longer than usual.

•	Voilà! You now have your phone running CM7! Make sure to have fun!