Posted by Jayce Ooi as How to
How to install firmware on Samsung Galaxy S II? You can flash official or custom firmware into Samsung Galaxy S2 with Odin. No need to wait for official firmware release through Samsung KIES and install it yourself with Odin3. Or flash custom firmware that you prefer. This step by step video guide will show you how to install new official firmware on Samsung Galaxy S2 with Odin3.
Note – You should not face any issue with upgrading to newer official firmware. Your applications and data will be intact. However, factory reset might be needed when you downgrade firmware to older version because you might face boot loop issue. Therefore, make sure you make a backup before install new firmware.
Step by Step Guide