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Before updating your phone's software, it's recommended that you back up the phone memory to ensure that no data is lost. It can also be useful to back up the phone memory regularly to ensure that no data is lost in case of defects and crashes. Follow these instructions to back up the phone memory.
Install Sony PC Companion
Find the download section on the web page to download Sony PC Companion.
Download and install Sony PC Companion on your computer.
Connect phone and computer
Back up phone memory
Follow the instructions on the screen to establish a connection to your phone.