How to perform Factory Reset on the(Ginger Bread 2.3) Samsung Galaxy S2(GT-I9100)?
STEP 1. GETTING STARTED
Note: The following illustration is based on Samsung Galaxy S II as an example of Ginger Bread 2.3 based Android system. The screen images shown below may vary between different models.
a) Tap on Applications
b) Now Tap on Settings.
c) Under settings menu scroll down and select Privacy.
STEP 2. PERFORMING FACTORY RESET
d) Now choose Factory Data Reset.
e) Tap Reset phone.
Note: If you select 'Format USB storage' option , all your data will be deleted.
f) Select Erase everything.
And you are done.