The explained steps in this Guide will help you to Factory Reset Samsung Galaxy Mega 6.3 with model numbers:

Samsung GT-I9200. Samsung GT-I9205. Samsung GT-I9208. Samsung Galaxy Mega 6.3 GT-I9200 Factory Reset Checklist:

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).