[Nexus 6P Q&A, Help & Troubleshooting] Lawlrus:
[MENTION=8715864]abdullahk6809[/MENTION]

Alright, so i figured it would be easier to post via my computer rather than my phone.

TLDR : If you don't want to read all of this then stick with 8.1 roms for the best battery life and no issues. Cr droid and Resurrection Remix both posted their final 8.1 builds and both have run flawlessly for me. The same goes for AICP and AFAIK they are still merging up stream changes though minor with their weeklies.

As far as 9.0, we do not have official support, so it's still being worked on to get the best experience/no issues. AICP 9.0 has worked out the best for me with 9.0 then followed by Resurrection Remix.

There is a huge thing you need to be aware of if you're not already, that being our 9.0 roms currently use two different types of encryption. AOSIP, AICP, Resurrection Remix, CR Droid all use full disk encryption. (FDE) which is the same encryption we have always used. For that you just use the offical TWRP. All of the 9.0 stock roms currently are using file based encryption(FBE) and for that you need to use a specific TWRP that was made for it, and if you are currently on FDE (which you are) you need to format data after flashing the rom, meaning you will WIPE ALL OF YOUR INTERNAL. IF you decide to go back to an 8.1 rom, or try one that uses FDE, you will need to do the same process. Switch back to the offical TWRP, and format data after you flash the rom. If you go to FBE and stay on it, then you do NOT need to format data/switch twrp going one from FBE rom to another FBE rom, or updating the current rom.

So when choosing what to flash, you need to read the OP of each rom and know which encryption it uses, or it will not boot. Roms that run FBE AFAIK always have the twrp needed linked in the OP.

With 9.0, as i said, it is still a work in progress since we have lost official support. So if you read the threads some people are reporting issues with calls, Volte, issues with whatsapp etc.. So read the threads at least the last 15 or so pages to see if people are currently having issues. Like i said previously i could tell you to go flash x rom, because it works the best for me. But then you have issues because you use whatsapp and can't send voice messages or w/e and i don't use it. With people using the device for different reasons, you need to take time to see what works for you versus just a one word answer that will work for you.

A lot of people are having issues with 9.0 because of battery life, but I do not see a huge decrease in battery life, but i don't use battery killing apps like face book, whatsapp, or play games or anything. If you really are only getting 3 hours SOT you might want to see what is using your battery via better battery stats or gsam, because it's possible apps could be doing it, and no rom will change that. If you find out that no rouge apps are really killing your battery, as was just stated, depending on how old the device is, you might need a new battery. This phone is a good device but they used pretty ****ty components on it, thanks China. I myself have not had battery issues but i bought my device like three or four years ago, some devices are older.

Anyways, that's about all i can really offer for advice, i don't spend nearly as much time on this forum as i used to because i end up getting into confrontations with people that spread misinformaation, or refuse to follow simple courtesy that are not rules such as asking for eta's etc..

If you end up having any questions i might be able to answer, send me a PM. It might take me some time to respond as i don't use the app as much as i used to, but i'm always willing to answer even the dumbest question when asked via private message.