The famous Chainfire is at it again, he has announced that he has successfully achieved root on 6 newer Nexus devices, including the newly released Nexus 9. The devices Chainfire has successfully rooted are the Nexus 4, Nexus 5, Nexus 7 2012 and 2013, Nexus 10, and, as previously mentioned, the Nexus 9. That last one is the most impressive, not only was Chainfire able to root the Nexus 9, but he was able to root that device about a week ago, pretty much just as it was released. The speed and reliability of Chainfire's roots is simply stunning to say the least, this is what has made him a beloved part of the Android community.
Chainfire took to his Google+ page today to state that his CF Auto Root files have all been updated to work with all of the Nexus devices mentioned above, pretty much every Nexus devices that has or will, at some point, received Android Lollipop, except the Nexus 6. Something important to keep in mind if you plan on using this new root method on your Nexus device is that all of these files will require that you use Fastboot and not flashable recovery zips. A second note, for some of these Nexus devices you will more than likely be required to also use an OEM bootloader unlock tool in order to successfully unlock your device's bootloader.
Once you have successfully used Fastboot then your device should load a special boot image that will install SuperUser. We thought it was worth mentioning that there are some significant changes in this release, they are as follows. The new variants of CFAR have the SuperSU ZIP embedded, there is a second included ZIP that patches the current kernel to run SuperSU at boot, and last but not least, current CFARs include SuperSU v2.20 which is not available anywhere else at the moment. All of these changes are for the better and overall are pretty impressive.
If you happen to be new to the Android rooting scene then it is in your best interest to read up as much as you can on what exactly you're doing to your device. A good place to do so before using this specific root method is on Chainfire's Google+ page which can be found in the source link below. If you are already experienced in rooting your Android devices then you can just jump straight ahead to downloading the image file needed for your device by clicking here.