If you are facing Screen rotation problem in Samsung Galaxy S2 so here is the solution. In the bellow image you can see a red line is indicating IC that is used in Rotation.
In most cases this problem can be due to water damages. So after disassemble check these parts. If you find out rust or carbon in it then clean it using electronics cleaner.
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Hard reset will set your phone in origional factorry settings. It will remove all the data and apps that you installed. Your contacts will be removed and you have to add them again.
we try to provide the best and latest flash files and firmwares, But we do not guarantee the accuracy or compatibility of any of the files. So use them at your own risk!.