The nexus 9 is the only Nexus device that is still on the old Android 5.0.1, however Google already released the form of factory images, it should pass some time till the update strikes the phone. But if you want to update it manually, then follow the guide bellow.
How to update Nexus 9 to Android 5.1.1
Installing Android 5.1.1 will make your phone like a new one, empty. This will erase all user data. If you have something to backup, do it now.
Step 1: If you don’t have it, install ADB/Fastboot
Step 2: Download Factory Image for the version of your Nexus 9, from the list bellow:
- “volantisg” for Nexus 9 (LTE) – 5.1.1 (LMY47X) – Download
- “volantis” for Nexus 9 (Wi-Fi) – 5.1.1 (LMY47X) – Download
Or check for Factory Images on Google developer’s page – here
Step 3: Now that you downloaded Factory Images, unzip the archive into a folder on the desktop or somewhere closer.
Step 4: If you didn’t unlocked bootloader on your Nexus, then we’ll unlock it now. Navigate to the folder where you installed fastboot/adb and in the address bar type: cmd, Mac users run Terminal and navigate to this folder. Plugin the device in the computer and in the Command prompt/Terminal write and hit enter:
fastboot oem unlock
Now, follow the instructions and choose to erase the device.
Step 5: Open the folder where we unzipped the Nexus Factory Image and in the address bar type: cmd and press Enter. Mac users run Terminal and navigate to this folder.
Now, type following commands:
- On Windows: flash-all.bat
- On Mac/Linux/ChromeOS/etc: sudo ./
This will flash all files to your Nexus 9, during the process your phone may reboot and you will see an Android figure, this may take some time, so please don’t unplug the device.
When the process finishes, you can simply use your new Nexus 9.