The built-in music player is missing. You can try the following methods:

Method 1: There may be a problem with the desktop display.

1. First enter other settings through the settings on the desktop.

2. Enter the application management--find the desktop application--clear the data and cache garbage, and then check whether the desktop application can be displayed normally.

Method 2: Back up mobile phone data (phone number, text messages, etc.) and restore factory settings.

Method 3: Re-flash the firmware.

1. First download through the OPPO official website--coloros--ROM, and download the firmware package according to the model.

2. Store it in the root directory of the phone's memory, and then press and hold the power button to force shutdown (for models after R9s, press and hold the power button + volume up button to force shutdown).

3. After shutting down, press the power button + volume down button at the same time, wait for the phone to vibrate, and then let go of the phone to enter OPPO recovery mode.

4. Click to clear data and cache, click "Install Upgrade File", find the flash package in the root directory to confirm the upgrade, then wait for the upgrade to be successful, and then check again.