Nexus 9 WiFi (flounder 0P82100) - volantis
Current firmware: Android 5.0.1, Build LRX22C
LRX22C from LRX21R
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LRX21R from LRX21L
LRX21R from LRX21Q
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LRX21Q from LRX21L
Instructions:
When you get your new Nexus 9 in the mail, please fire it up and DO NOT accept an OTA that comes out of the box. Please go and get the Android build #, the values of ro.build.date.utc and ro.product.name from build.prop, and the bootloader version (which you'll need to reboot into bootloader mode in order to do). Once you have that info, please post it here so we can get this thread started!
Then, after that, if there's an OTA available out of the box, please get the URL of the ZIP file from adb logcat. Once you do that, feel free to apply said OTA update and enjoy your tablet!
credits: oldblue910 @xda