First, the computer downloads and installs the PP assistant.
The device connects to the computer and trusts it. If the computer doesn't have iTunes, it will automatically download and install it.
Wait for the device identification to succeed, and click Install Mobile in the main interface.
After the device is connected successfully, open the PP assistant on the mobile phone desktop, enter "Cool Dog Music" in the search bar, click Search, drop down the page, and click Version History to view all.
Click View All, click the version history you want to install, and select Install to successfully install the cool dog version history.