I bought the nexus 9 (HTC device) december last year to replace my iPad, I wanted to get away from Apple and I never regretted that choice, by the time the iPad 2 came out, no Adroid device was up to that quality and the Adam Notion Ink I bought before the iPad was a big failure. That device is now serving as a attachment to my stereo and updated to 4.1 still does a streaming job but as a wireless working device it was useless.
The Nexus 9 was not a cheap device and therefore I think not a lot of people are playing with it and or developing new roms for it so after some attempts I am back on Android 5.1.1 and using Google Factory image you can find here . If you go to xda-developers you find a few roms out there of which I tried AICP, Candy5 and some CM12.1 attempt but when it says "this is my first build. Its untested" I am not really tempted to try so when Google finally launched the factory image for 5.1.1 (much later than on any of the other Nexus devices) I flashed it again.
Howto flash
The Google page discribes how to flash it but it does not work because the zip file it too large, I do not understand why Google does not update that page because it will happen to everbody but no word on that page, I guess because the page says Nexus files for Developers I guess everybody knows how to do it the proper way. I had to find out and place the procedure here:
I am using an Ubuntu with 15.04 install and all the adb tools, I downloaded the zip file from the above website and unzipped that file, moved the command prompt into that directory and did:
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adb reboot bootloader
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fastboot flash bootloader bootloader-flounder-3.44.1.0123.img
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fastboot reboot-bootloader
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fastboot flash recovery recovery.img
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fastboot flash boot boot.img
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fastboot flash system system.img
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fastboot flash vendor vendor.img
Lastly, if you want, you can wipe the cache with this command – fastboot flash cache cache.img
Hope this was useful and to see you soon!