Google, as promised last week, has made available for download an operating system update Android 7.1 Developer Preview (developer preview) for devices participating in the beta testing program Android – Nexus 5X, Nexus 6P and Pixel C, whose list will be expanded next month to the Nexus 6, Nexus 9, Nexus Player and General Mobile 4G (Android One) with the release of Android 7.1 .1 pre-final version.
Registered devices in this program will automatically receive an operating system update to Android 7.1 Developer Preview. If the devices have not been registered yet, then to register them, you need to go to the android.com/beta page and enable the corresponding option for devices available for participation in the program, which will receive this update a little later. You can also download this update manually.