The explained steps in this Guide will help you to Factory Reset Samsung Galaxy Win Duos with model numbers GT-I8552, GT-I8552B, And you can apply the same steps on Samsung GT-I8550E, GT-I8550L with single SIM Card.

1- This process restores the Android platform to its original state and wipe all your data, So backup all the wanted data (Contacts, SMS, Photos, Videos,… Etc).

2- Make sure that you know the Google account name and password.