Originally Posted by tiger4android
hi, i accidentally upgrade my tmobile galaxy s2 2.3.6 to 4.0.4 do you have any software to downgrade from 4.0.4 to 2.3.6? thank you
Welcome to the forum.
Yes, if you follow the guide in the OP, you can download and install Gingerbread 2.3.6 if you have the T-Mobile Galaxy S II SGH-T989 phone.