Resetting your Optimus G will restore the default settings of your device. It will also delete all your files on your phone, so it is recommended to backup all your important files on your computer.
Luckily in Optimus G, you can backup your data through your phone on privacy settings before wiping all the data on your phone. But if you want to erase all the content on your phone, then there’s no need for you to backup your data.
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