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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.
Connect phone and computer
Open the cover on the left side of your phone.
Connect the data cable to the phone phone socket and to your computer's USB port.
Press Turn on USB storage.
Back up phone memory
Start a file manager on your computer and find your phone in the computer's file system.
Go to the required folders or the required files and copy them to your computer.