Phoenix AEX is the extended AOSP based custom ROM available for the OnePlus 3 and the OnePlus 3T. The ROM pulls out stock UI/UX with the Substratum theme engine onboard. If you are confused about the ROM name, the name has been given because of a blend of features from different sources. Phoneix AEX combines features from ROMs like Paranoid Android, Resurrection Remix and some features produced by independent developers. It only borrows the features that are the most useful. Phoenix AEX for the OnePlus 3 and 3T provides a smooth performance, a reliable battery timing and a stable system to rely on. 
Here is a list of complete Phonex AEX Custom ROM.
Full EAS support – Both ROM and Kernel side
Marlin Power HAL – Tweaked for months for balanced battery and smoothest performance
Kernel based on RenderKernel + few additional features /see github/
Wifi: 2,4ghz channel bonding enabled
ROM is odexed for better 1st boot time.
sRGB toggle integrated and ON by default
Small Quick tiles capped to 6 – No matter the dpi used
High Brightness Mode Quick tile
Framework implemented Pocket mode (PocketJudge) /Credits to AOSPA/
Device specific custom firmware flash – You don’t need to search for the right firmware anymore! (This will flash the needed firmware depending on your variant (3/3T) during the ROM installation) /Credits to AOSPA/
Camera HAL1 and HAL3 are fully working – Now you can use whatever 3rd party camera you want!
ROM included cameras:
OOS camera port Camera-O² by siankatabg
aHDR, HQ and HDR modes
1080p60 recording (limited to 42-51 fps cause OOS blobs not released)
Timelapse, Slowmotion and Panorama working.
RAW capture
Google Camera (From Android O preview)
FULL 1080p60 recording (yes full 60fps video)
SloMo video with audio (SloMo can be adjusted in Google Photos)
Custom PAEX bootanimation /Credits to sLimba a.k.a. Rakpere/
Custom PAEX Wallpapers added – One of them is set by default
Debloated – Removed browser, email, camera, gallery and music player apps
Pre-builds added – OOS Camera (Camera-O²), OOS Gallery (Gallery-O²), OOS Music player, Google Camera and Substratum
OTA configured for this ROM
Round Icons
Animation scale set to x0.5 by default
Display wake from sleep faster /Credits to Sultanxda/
UBER 6 GCC used for the kernel compiling
Alert slider with additional features and fully working
Many under the hood device specific optimizations
If you don’t like sticking with the stock ROM of your OnePlus 3/3T, you have a number of custom ROMs to go with. There are stock based custom ROMs and then there are the complete and pure custom ROMs. Stock based custom ROMs are good to go with as far as you care about a bug-free and a smooth system. If you can handle slight bugs and you want plenty of features, you probably want to go with a pure custom ROM. Phoenix AEX is not a stock based custom ROM. It’s built out of different sources that are open. You’ve already had a look on the features offered by this ROM. Now if you have made up your mind to flash it on your OnePlus 3 and OnePlus 3T, then let us handle it from here.
You can install the ROM on your phone using the latest build of TWRP. Flashing the ROM is quite easy. It also needs a Gapps package since it doesn’t include any apps at all. In this post, you will learn how to install OnePlus 3/3T Phoenix AEX Custom ROM.
Preparation
- This ROM is only for the OnePlus 3/3T. Do not try this on any other phone.
- Charge your phone good enough so that it lasts during the installation process.
- Backup your important contacts, call logs and text messages. Also, create a Nandroid and EFS backup. This is highly recommended because we will be factory resetting the phone during the flashing process.
- Install TWRP Recovery on your OnePlus 3/3T:
- Get an external SD card or a USB OTG to make the installation easy for yourself.
- Follow this guide carefully.
Note: This is a custom ROM and the process that leads to the execution of this ROM on your OP3/3T is also custom. Such procedure are not recommended by the device manufacturers. If something goes wrong, TechBeasts or the ROM developer or the device manufacturers may not be held responsible. Make sure that you understand all the risks involved and you are doing this at your own risk.
Install OnePlus 3/3T Phoenix AEX Custom ROM
- Download PhoenixAospExtended-v4.4-oneplus3-20170719-2204-siankatabg.zip file. Copy the downloaded ROM file to your phone’s external SD card or the USB OTG.
- Download Gapps ARM64 for Android 7.1 Nougat and copy them to the external storage as well.
- Boot your OnePlus 3/3T into TWRP recovery. To do so, power down your OnePlus 3/3T. Now turn it on by pressing and holding Volume Down + Power Key. As soon as the phone boots up, leave the keys and let it boot into TWRP.
- Once you are in the TWRP recovery, tap Wipe > Advanced Wipe > Select System and Data partitions > Swipe screen to wipe.
- Now get back to the main menu in TWRP recovery and tap Install > Locate and select PhoenixAospExtended-v4.4-oneplus3-20170719-2204-siankatabg.zip > Swipe screen to flash.
- After flashing the ROM, get back to the main menu in TWRP and similarly, flash the Gapps file.
- Once done, reboot your phone into the system.
- First boot can take up to 10 minutes. Let the phone prepare the new system. You will have the new Freedom OS ROM up and running on your phone now. That’s all.
