How to install ICS on Samsung Galaxy S II

To see another method, follow this link:
How to install ICS on Samsung Galaxy S 2 ( 2nd method )


This method involves using a third-party utility, called Odin. This utility is developed by open-source developers and helps flash the firmware directly to the Samsung Phone without the need of the official Kies software. However, you will initially need to install the Kies software for the necessary drivers to be installed.Warning: If you are using this method, do it with a lot of caution, and if you are doing it for the first time, read up on related articles on the XDA forums before proceeding. The method of using Odin for flashing the ICS firmware is for those who have migrated away from Samsung’s official firmware and are making use of third-party ROMs for their SGS IIs.  

Before you proceed, you will need the following:

• The Odin utility which can be downloaded from here
• The ICS firmware for SGS II which can be downloaded from here.  Alternatively, you can hunt for different versions from the XDA forum. 

Take all necessary backups of your phone’s data using respective apps and utilities. Next, download the utility and the firmware (links mentioned above) and save them on your desktop. Once you have the two files, create a folder and decompress the downloaded files within that folder. You will be left with a few files, out of which the most important one is Odin (.exe) and the firmware (.tar.md5) files. Next, you need to switch your phone into the download mode. To do this, you need to switch off your phone and then press the following buttons—‘Volume_Down + Home + Power’ and your phone will display the download mode. Now connect the phone to your PC and let Windows install the necessary serial drivers for your phone. Once done, start the Odin utility. If your phone has successfully been detected by Odin, you will see the box with the header ‘ID:COM’ turned yellow and highlighting the phone connected via a COM port. This states that the SGS II is now ready to be flashed with a new firmware. Next, go ahead and check the box next to the ‘PDA’ and then hit the ‘PDA’ button and choose the ‘.tar.md5’ file you decompressed from the downloaded firmware file. Note: Do not check any other boxes and leave all settings as they are.

Once done, hit the ‘Start button’ and your SGS II will be flashed with the new firmware. After a successfully firmware flash, the phone will automatically restart. You are now ready to use your SGS II with the ICS firmware.






Source:- Tech2