sprawdziłem u źródła i jest jak przypuszczałeś...
hank you very much for contacting the authorized US Distribution Center for the Astell&Kern brand.
Tidal is the only music streaming application that is available on the KANN.
Other music streaming applications, such as Spotify and Amazon Music, are supported via Android Open Services Application and it is only available on the current generation of A&K media players running the updated UI. (Such as: KANN Cube, SE200 and etc...)
The current players feature a newer version of Android OS that is optimized for the added technical features and services. Astell&Kern's current generation media players also feature faster, multi-core CPUs that provide a smooth, fluid user experience when running multiple apps and Amazon streaming process.
While Astell&Kern will not bring music streaming feature through Android Open Applications to the previous generation of media players, such as the KANN, Astell&Kern Technical Development team continues the effort to look into adding additional features in future firmware updates to provide current A&K media players with more value.