It is usually related to your mobile phone, or it may be that your mobile phone has insufficient memory and no running space

You can first clear the cache and data of each software in the mobile phone

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Then just move the software in the phone’s memory to the sd card

This problem can be solved by using App Store. First, download an App Store on your computer

Then turn on the USB debugging of the phone and connect the phone to the computer

After the phone is successfully connected, open App Store--My Phone--Apps

Then connect the phone Check the music in the memory and click to move it to the SD card

In this way, the system memory of the phone will be freed