LineageOS is a free, community built, aftermarket firmware distribution of android, which is designed to increase performance and reliability over stock android for your device.
All the source code for LineageOS is available in the LineageOS Github repo. If you would like to contribute to LineageOS, please visit our Wiki.
This post is for Nexus 9 (Wi-Fi) model.
See post #2 for Nexus 9 (LTE) model.
The newest lineage 14.1 flounder (Wi-Fi) builds rely on proprietary vendor and firmware components from the N9F27M (October 2017) monthly update from google. This means your device needs to have the vendor and bootloader img from that update. They can be extracted from the factory image on google's site here. Or you can use the ones linked below that I already extracted:
The vendor img is flashable with twrp or fastboot, but for the bootloader img use fastboot.
More information and installation instructions can be found on the LineageOS wiki here.
LineageOS servers no longer make 14.1 builds for any devices. You can use my builds here. My older builds are here.
Google apps: http://opengapps.org/?arch=arm64&api=7.1&variant=nano (Use arm64 / 7.1)
su addon zip (for root): Install zip / Removal zip
NOTE#1: After su addon install, root is disabled by default. You can enable it in developer options.
NOTE#2: My unofficial builds do not force encrypt.
Weather Provider Addon (Optional)
For those that like the lineage cLock widget, here's the OpenWeather apk you need to get weather info.
Note: You'll need an api key from OpenWeather.
Many thanks to the LineageOS team and all the contributors out there in the community :good:
Device tree: https://www.github.com/LineageOS/android_device_htc_flounder/tree/cm-14.1
Kernel tree: https://www.github.com/LineageOS/android_kernel_htc_flounder/tree/cm-14.1
Vendor tree: https://github.com/TheMuppets/proprietary_vendor_htc/tree/cm-14.1
Android version: 7.1.2 Nougat
Kernel version: Linux 3.10.103