Factory resetting your Android phone basically means that you are reverting it back to how it was when it first came out of the factory. All the data on your phone will be deleted. Therefore, there are few safety measures you need to consider before doing a factory reset on your Android phone.
What are the safety measures?
• Moving all of your pictures, videos, and music files onto an SD card or your personal computer.
• Syncing your phone with a Gmail account. Having your phone synced with a Gmail account ensures that you don’t lose any of your contacts with the factory reset.
• Removing the SD card from your phone. This step is not really required since unless you check the little box that says “format SD card”, the SD card won’t be affected by the factory reset, however you might still want to remove it just to be on the safe side.
What about backing up the applications?
Since the issues you are experiencing with your Android device might be caused by the applications you have installed, I don’t suggest backing up your applications. Instead, make a list of the apps you absolutely need and manually reinstall them after the reset, so that you can monitor the effect each app has on your phone’s performance separately.
This is all you need to know about factory resetting your Android phone. Performing the factory reset is a fairly easy process, however if you need help with it, you can read about it here.