There is two methods to root
HTC Nexus 9
Method 1 :Rooting it with
CF Auto Root tool Click
here to Download it
HTC Nexus 9 Review:HTC Nexus 9 is super-slim tablet with a massive 8.9-inch IPS HD display with a resolution 2048 x 1536 pixels and protected by Corning Gorilla Glass 3. It is powered by 2.3 GHz, 64-bit NVIDIA Tegra K1 Dual Core processor, 2 GB RAM, 192-core Kepler GPU, 8MP rear camera, Bluetooth v4. 1, and 6700 mAh battery to stay awake for a whole day at a single charge. The most amazing feature of HTC Nexus 9 is that it runs on the sweetest Android 5.0 Lollipop version.
Requirements:Rooting process might take some long time, so it’s advisable to charge your Nexus 9 tablet up to 70 – 80% charging.
Make sure you have unlocked the bootloader of the tablet.
Enable “OEM Unlocking” & “USB Debugging” options found under “Settings > Developer options”.
Download
ADB & Fastboot drivers.
How to Root HTC Nexus 9 Easily [Windows/Mac OS X/Linux]Step 1) Download “
Chainfire Nexus 9 Rooting Package” on your Computer.
Step 2) Extract the downloaded rooting package in the same folder where you have extracted ‘ADB and Fastboot Drivers’. (Ex.: C:\Fastboot)
Step 3) Shut down your tablet.
Step 4) B
oot your Nexus 9 in to fastboot mode by pressing and holding “Volume up + Volume down + Power Key” for a few seconds.
Step 5) Connect the HTC Nexus 9 to your Computer with the help of official USB data cable.
Step 6) Now, navigate to the folder where you have placed all the rooting stuff and open the command prompt there. To do so:
Press and hold “Shift Key” and press “Mouse Right-Click”, sub-menu will opens-up and from there, choose the option “Open command window here“.
Step 7) Then you have to type the following commands on command prompt to root HTC Nexus 9.
fastboot boot inject.img
fastboot flash boot patched.img
Step 8) The above will only few seconds to flash needed files to root HTC Nexus 9.
Step 9) That’s it! Your Nexus 9 is rooted now!
Step 10) Reboot your tablet by holding ‘Power Key’ for 10 seconds.
Finally, you have got a root access on your premium Nexus 9 tablet. Well, now, you are free to try out various Root apps, Custom Kernels, Custom ROMs, etc. In case, if you face any issues then you can share with us using the comments box below. Enjoy