[ROM][OFFICIAL] LineageOS 14.1 for Nexus 9 (flounder) - Nexus 9 Original Android Development

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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.
Important Info
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:
* vendor-flounder-n9f27m.img
* bootloader-flounder-3.50.0.0143.img
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.
Download Links
LineageOS: https://download.lineageos.org/flounder
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.
https://mirrorbits.lineageos.org/WeatherProviders/OpenWeatherMapWeatherProvider.apk
Note: You'll need an api key from OpenWeather.
Stats
https://stats.lineageos.org/
Credits
Many thanks to the LineageOS team and all the contributors out there in the community :good:
Contributors
Hashbang173, razorloves
Source Code:
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
Status: Nightly

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Reserved
This post is for Nexus 9 (LTE) model.
Important Info
The newest lineage 14.1 flounder_lte (LTE) builds rely on proprietary vendor and firmware components from the N4F27P (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:
* vendor-flounder_lte-n4f27p.img
* bootloader-flounder_lte-3.50.0.0143.img
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.
Download Links
LineageOS: https://download.lineageos.org/flounder_lte
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.
https://mirrorbits.lineageos.org/WeatherProviders/OpenWeatherMapWeatherProvider.apk
Note: You'll need an api key from OpenWeather.
Stats
https://stats.lineageos.org/
Credits
Many thanks to the LineageOS team and all the contributors out there in the community :good:
Contributors
Hashbang173, razorloves
Source Code:
Main device tree: https://www.github.com/LineageOS/android_device_htc_flounder_lte/tree/cm-14.1
Inherited 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
Status: Nightly

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Wooooh! It's here

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Can Nexus9 (lte) use this rom? If flash this rom only can not use lte,i can accept it.

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Yeah! This is great news!
Will definitely flash this rom on my laggy N9

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Can I dirty flash from the unofficial builds or should I do a full wipe?

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Will it work on the LTE version? I don't mind if LTE does not work as long as I can try out the ROM without getting boot loops.

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hextence said:
Will it work on the LTE version? I don't mind if LTE does not work as long as I can try out the ROM without getting boot loops.
Click to expand...
Click to collapse
I think so!

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LTE version?
For people who need LTE

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perfec

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Is the Nexus 9 LTE going to have official support?
Sent from my iPhone using Tapatalk

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Thank you very much! I hope it is less laggy than the stock firmware.

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vendor image is critical at time of OS installation
Hi there.
First of all, thanks so much for the official N9 build for Lineage. Really appreciate it.
I wanted to describe my experience this morning. I should start by saying that I am *not* a hacker, just an enthusiastic user. I can follow instructions, and have been using non-stock ROMs since Cyanogen 7.
I was upgrading from the most recent version of Cyanogen. Before I started, I upgraded to the latest TWRP. Then when booting into recovery, found that my decryption passphrase didn't work. I downgraded version by version until twrp-3.0.2-0-flounder.img which is apparently the latest that worked. After installing Lineage OS, I upgraded to the newest TWRP again.
More importantly, I wanted to point out that by following the instructions on the Lineage OS wiki for the Nexus 9, I almost got to the point of thinking I had bricked my device.
The main reason is that the instructions don't mention the Vendor image issue at all: https://wiki.lineageos.org/devices/flounder/install
After wiping, installing Lineage OS and GApps pico, I rebooted. When it got to the decryption passphrase, I got the pop-up warning about the Vendor image being mismatched. No problem, I thought, as I've seen that before on Cyanogen installs. I put in my decryption passphrase. The screen remained unchanged for a couple of minutes, then I got something I'd never seen before. A page notifying me that my passphrase was correct, but the system was corrupt, and an option to fix it (no other option was available except to force power-off). So I took that option and it rebooted into TWRP. It boots into recovery and apparently runs a script and reboots the system again. But the same issue occurred again, nothing was fixed.
No problem, I thought, I'll just power-off, boot into the bootloader, enter recovery, and try again. Except that after installing Lineage, I found that volume-down+power button no longer started the bootloader!!! I tried many times, but the best I got was the device booting into the system and getting the same problem where it said the system is corrupt. It was at this point that I thought I had bricked the device - can't boot into system, can't get to the bootloader, so can't get to the recovery.
After many attempts, I tried one last thing:
Boot into system
On the corruption notification screen, I pressed the button to "fix" the system corruption
when the device rebooted into Recovery to run the script, instead of entering my passphrase, I hit cancel. This cancelled the script process but left me in recovery. I then selected reboot -> bootloader. Success!!
I was then able to connect the device to my laptop and copy the Vendor image I had extracted from the official Google system image using
Code:
fastboot flash vendor vendor.img
I then rebooted, and everything worked fine.
So it seems that in this instance, it may be critical to install the Vendor image before the first reboot. In earlier versions of Cyanogen when I had a vendor image mismatch it never prevented the device from booting and I was able to update it later on.
In which case, whoever has access to the wiki on the Lineage website - could you add those instructions in?

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Just to add - I now seem to have bricked the device. Everything was working fine. I rooted the device using the supplied zip. It booted up fine. Now it won't reboot. It gets to the decryption passphrase field - verifies the password, continues to boot, and never finishes.
I can't get into the bootloader. Volume down+power doesn't work. Is there another way to do this?

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Was using stock android on my Nexus 9. Already had root with the latest TWRP recovery installed. Did not run into any issues during the install(forgot to flash the Gapp at first, but could do it later in recovery, again no issues)
This is the first time I am using a Custom ROM. Got some questions .
1. I have the default apps for the lineage OS along with the same Gapps, How to remove the default lineage OS apps?
4. If anyone can share the advantages of the Nightly over custom ROM , it'll be great.
Other than these, no other major issues so far. will update the thread with the user experience

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For anyone with LTE model please test this build. Let me know if there's any issues with lte or anything.
https://www.androidfilehost.com/?fid=889764386195906667
Here's the N4F27E vendor img for the LTE model, if you need it.
vendor-volantisg-n4f27e.img
thanks
No more testing needed. Results were good. Nightlies started for LTE model.

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yhvo2gt9 said:
Just to add - I now seem to have bricked the device. Everything was working fine. I rooted the device using the supplied zip. It booted up fine. Now it won't reboot. It gets to the decryption passphrase field - verifies the password, continues to boot, and never finishes.
I can't get into the bootloader. Volume down+power doesn't work. Is there another way to do this?
Click to expand...
Click to collapse
Decryption passphrase in TWRP? Or Lineage?
---------- Post added at 04:51 PM ---------- Previous post was at 04:49 PM ----------
Just to let you all know, I got Lineage up and running, restored from my gmail account. I had stuck with 6.0.1 stock, 7 never cooperated, it was still getting laggy and what not. I will post more details about the install in a bit, but I just wanted to let any curious parties know this build seems to be working OK

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Is the poor volume fixed in the official build or do we still need to flash a custom kernel to fix it?

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I just flashed a minute ago. I've been waiting for this to be released. I switched over to Lineage on my OnePlus when it first came out. The nexus has been way too laggy on the latest stock releases. I hope this helps. I received a vendor image mismatch error on boot up but so far no issues. I'm going to flash gapps and will report back later. Thanks for working on this!!

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The LTE one appears to be working fine in my tablet. Thank you
Sent from my iPhone using Tapatalk