There has been a lot of news regarding the Nexus 9 tablet recently, with the device receiving an update to Android 5.0.2 Lollipop and then subsequently an over-the-air update to Android 5.1.1 Lollipop.
Nexus 9 users that have not yet been able to receive their updates to Android 5.1.1 Lollipop have a few options on how to upgrade the operating system of their tablet.
The first option is for users to remain patient and wait for the over-the-air update of Android 5.1.1 Lollipop to be pushed out into their Nexus 9. While the update is out, there is simply no definite time that users can expect to receive the update on their device.
The second options is to install the Android 5.1.1 Lollipop by downloading its factory image for the Nexus 9, which is now available through the Factory Images for Nexus Devices page of the Google Developers website.
Manually installing the Android 5.1.1 Lollipop operating system on the Nexus 9 will of course require much more work compared to just waiting for the operating system to be received by the tablet through an over-the-air update, but it is a viable option for users that are not willing to wait for the update for whatever reason, including performance and stability issues caused by Android 5.0.2 Lollipop.
Installing the factory image will require users to have a USB cable to connect their Nexus 9 to a computer where the Android SDK is installed. The Nexus bootloader of the device should also be unlocked. The complete instructions for installing factory images can be seen in the page where the images are located, and it is important the users should follow the instructions carefully to avoid any unwanted malfunctions.
For users that are not willing to wait for the update and are not confident that they will be able to properly install Android 5.1.1 Lollipop on their Nexus 9 tablets using factory images, the third option is to access an OTA link, which has been captured by Android news website Android Authority.
There would be a number of users looking to update to Android 5.1.1 Lollipop right away if they have Android 5.0.2 Lollipop installed, or to skip that version of the operating system altogether and go straight to Android 5.1.1 Lollipop. This is because the Nexus 9 is experiencing bootloop problems with Android 5.0.2 Lollipop as soft-bricked devices.
There are several methods to try to fix soft-bricked Nexus 9 devices due to the Android 5.0.2 Lollipop, but there have also been reports from users that the update bricked or killed their Nexus 9 devices.