what is the process for upgrading?

For devices that are required to upgrade the upgrade process is the same as is always has been and you will be prompted with an upgrade message when opening the Muve Music application.   This process is not available over Wi-Fi and if you do not complete the upgrade Muve Music will not be available for use until the new upgrade has been installed. For devices choosing to upgrade Muve Music on an optional basis, you will be directed to the Google Play store where you can upgrade.  Google Play upgrades are available via Wi-Fi or Cricket 3G Network.