OnePlus One users are in for a special treat, as the industrious XDA-recognised contributors, Quasar and h2o64, have released the latest Android 5.1.1 AOSP custom ROM for the flagship smartphone, which is based on Code Aurora Forum (CAF) and AOSParadox project. The ROM is allegedly based on stock vanilla firmware with modified bits of CAF to make it fully functional on the OnePlus One.

As the ROM is fully custom-built with CAF sources, other third-party custom kernels will not be compatible or boot with it. Consequently, rooting the device is possible only by flashing SuperSU as it is an AOSP stock Android build.

Note: The Google Apps (Gapps) backup script is missing in this release and hence it is imperative that Gapps needs to be reflashed with each update. Besides, the data activity indicator arrows are improperly aligned with this build and will be fixed in the forthcoming update.

Interested users may go ahead and install the latest Android 5.1.1 AOSParadox Project 1.0 ROM on OnePlus One, using the step-by-step guide provided below. IBTimes UK will not be responsible for any damage to the device during or after the firmware installation. Users are advised to proceed at their own risk.


-Fixed NFC

-Fixed hardware button backlight (brightness is low)

-Fixed video recording

-Added Google Webview support to fix Google Play Services FC at startup wizard

-Fixed a bunch of wakelocks caused by AOSP systemupdateservice

-Added remaining charge time

-Added a bunch of APN fixes, so messaging issues should be fixed now

Downloads Required

Google Apps


  • The instructions given in this guide are meant for OnePlus One only. Verify device model number by navigating to Settings > About Phone.
  • Ensure the phone has at least 80% battery charge to prevent unexpected device shutdown (due to battery drain) while installing the ROM.
  • Back up data and settings using a recommended custom recovery tool, like ClockworkMod (CWM) or TWRP, as it creates a complete image of the existing phone setup. In Recovery, choose Backup and Restore and tap Backup.
  • Verify correct USB drivers for the phone are installed on the computer (download OnePlus One USB drivers).
  • Enable USB Debugging mode via Settings > Developer Options (if running Android 4.0 or above) or Settings > Applications > Development (if running Android 2.3 or earlier).
  • Ensure that the device is rooted with CWM recovery installed and its bootloader is unlocked.

Steps to install Android 5.1.1 AOSParadox Project 1.0 ROM on OnePlus One

Step 1 - Download Android 5.1.1 AOSParadox Project 1.0 ROM for OnePlus One on the computer.

Step 2 - Connect and mount the phone's USB mass storage on computer with USB cable.

Step 3 - Now, copy the downloaded AOSP ROM zip file to the root folder on the phone's SD card.

Step 4 - Power off the phone and disconnect its USB cable from the computer.

Step 5 - Boot the device into Recovery Mode by pressing and holding Volume Down and Power buttons together.

Step 6 - Once the phone enters CWM Recovery, perform a full data wipe task by clicking Wipe Data/Factory Reset. Use the Volume keys to navigate between options and Power button to select an option in the Recovery Mode.

Step 7 - Perform Wipe Cache Partition and wait until the process completes.

Step 8 - Perform Wipe Dalvik Cache as well. To do this, go to 'advanced' option and then click Wipe Dalvik Cache. This will help in preventing boot loop issues or any boot ROM related errors during firmware installation.

Step 9 - Then return to the main recovery menu and choose Install Zip from SD card.

Step 10 - Click Choose Zip from SD card. Use volume keys to navigate to the AOSP ROM zip file that you copied earlier to your phone's SD card and choose it by tapping the Power button. Confirm the ROM installation on next screen and the installation process will begin.

Note: Repeat Step 9 and Step 10 to install Google Apps (Gapps) as well.

Step 11 - Once the ROM and Gapps installation completes, go to "+++++Go Back+++++" and select Reboot System Now in the Recovery menu.

The phone will now reboot and the first boot may take about five minutes to complete. So, please be patient.

Your OnePlus One is now running the latest Android 5.1 Lollipop via CyanogenMod 12.1 custom ROM. Go to Settings > About phone to verify the firmware version installed.

[Source: XDA]