1. First of all it is necessary to download an operating system.

2. Seven times press an inscription "number of assembly", the last line in data on phone, before emergence of an inscription "You became a developer!"

3. Leave the menu on a step backwards and open the For Developers menu.

4. Put a tick opposite to an inscription "Debugging on USB"

5. After you switch off the nexus smartphone and pass into the engineering mode, read as to Start Android in the fastboot mode.

6. Clamp at the same time the button of inclusion and the button of reduction of loudness, on the screen there is a droid lying on a back with an open cover.

7. We connect nexus to the computer through an USB cable.

8. Open the Android-L\adt-bundle-folder.

9. Start .exe the SDK Manager file.

10. There will be a window, wait for the end of scanning.

11. Below find in the developed window and press an inscription of "Deselect All". Ticks will be cleaned.

12. Press a tick android 5.0 and allocate all block.

13. Press "Install" further, agree with conditions, once again press the Install button.

14. Within 10 minutes the insertion will be filled in, observe process on a green strip.