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Install latest Android 4.1.2 Jelly Bean on Galaxy S2 I9100 Download and Extract your Android 4.1.2 firmware. Extract Odin Zip File to Run Odin.exe Turn OFF the Phone Now you will Put S2 in Downloading Mode By Pressing(volume down + alongside Home + Power Button together Run Odin In PC with Administrator Rights Connect Galaxy With PC Odin shows notification "Added" Select The Following File In Odin Click the ‘PDA’ Button, and select the .tar file extracted in Step 1. Click the ‘Phone’ Button, and select file with *modem* in its name (Ignore, if this file does not file exist). Click the ‘CSC’ Button, and select file with *csc* in its name (Ignore, if this file does not file exist). Click the ‘PIT’ Button, and select the .pit file. Use only if you got it while extracting in step 1 above, otherwise ignore it. In Odin window, make sure Auto Reboot and F. Reset Time checkboxes are selected. Please make sure that Re-Partition checkbox is selected, only if y

Make Sure Phone is Rooted (How To Root) Installl CWM from Play Store In CWM chose model and install recovery Download Official CM9 Rom Copy CM9 Rom in Sd Card Reboot phone In recovery by Pressing (Power Button + Volume Down + Menu button together) Now Recovery is Open .You can navigate using Volume buttons and select an option by pressing Home button. Now select "wipe data / Reset Then Select " Wipe Cache Partition "  Now go to Advance And Select " wipe Dalvik " Now Go Back to Main Menu Select " Install Zip From Sd Card " and Browse for CM9 Rom In a few seconds the ICS official CM9 ROM will be installed on your LG Then go back and Select " Reboot System Now " Now you Have successful Install ICS(4.0.1) In your LG Optimus E400 Download Links Download CM9 ROM  By Arslan Chuhan

There are many method to root LG E400 but all of the method not working perfectly they do not root phone properly ROOT GUID Install mobogenie in pc to install driver for E400 Run Mobogenie And Connect your Phone With Pc  Make Sure USB debugging is Enabled ( go to setting>application>development> then enable debugging) Mobogenie Automatically Install  Driver  Download Kingo Android Root Run Kingo Android Root It automatically Found Phone Click On Root It will Root your Phone in few minutes  If u see Superuser in Apps then your phone is Rooted Download Links Download Kingo Android Root Download Mobogenie

Installation Guid Back up your Current Rom Charge Your phone 50% Download Android 4.2.1 and CWM and don,t extract Copy downloaded file to SD Card Turn Off Mobile  Turn In Recovery Mode by Pressing (volume up +home button+ power Button) Select "apply update from sdcard and select CWM Now in Your Phone in CWM  Select"wipe data factory reset" Select "wipe cache partition " Return to main menu and then choose “wipe dalvick cache " Select "Install zip From Sd Card " chose zip file from directory of sd card Installation Process is Start and Finish in 2 Minuts Now again Turn Phone in Recovery Mod And again Select"wipe data factory reset" n Select "wipe cache partition " Now Reboot System                                             Download Links Download JellyBlast V3 Custom ROM Download CWM By Arslan Chouhan

Installation Guide 1  -Turn off Mobile  2  -Turn On In Download Mode by Pressing (Volume Down + Home Button+Power Button) then      press volume up button to continue  3 - Extract the download file 4  - Now Open Odin and connect Your Phone With PC 5  - Odin show Mobile Added(show yellow box) 6 -In Odin Click PDA and open PDA file just Download 7 -Do same With Phone and open phone File(Modem) 8 -Do same with Css and open CSC File 9 -Click On Start Button It will take 5 Minuts and Your phone is Ready Download Links Stock Rom Odin3-v1.85.zip Enjoy