Revert Android Update 4.0 to 3.0/3.2 Is it possible to downgrade from Android version 4.0(ICS) to 3.0(Honeycomb) after upgrading to ICS? Can any one help me.
As I already wrote in my comment: A downgrade (as well as an upgrade) can be performed by flashing the corresponding ROM (for references, see other downgrade questions). To find a matching ROM, please see Where can I find stock or custom ROMs for my Android device?. For the process of flashing, you might want to check with the rom-flashing tag, especially the questions dealing with the SGS2.