Here’s how to download and install OxygenOS Android 5.0.2 Lollipop ROM on OnePlus One. For complete step by step instructions, head past the jump.
Do note that while rooting and flashing a custom ROM on your OnePlus One does not void your warranty, any damage to the phone from doing so will not be covered by it.
- Fastboot and ADB installed and setup on your computer. Check out the instructions here: How To Set Up Android ADB & Fastboot On Windows
- TWRP custom recovery.
- OxygenOS ROM for OnePlus One.
Unlocking Bootloader and Installing Custom Recovery
Step 1: To begin, download the TWRP custom recovery from here and place the file in the Fastboot folder in the installed Android SDK on your computer.
Step 2: On your phone, enable the installation from Unknown Sources from Settings > Security.
Step 3: To boot the phone into Fastboot mode, hold down the volume up key + power button. When you see the Fastboot logo, you can now connect the phone to your computer.
Step 4: Run Terminal on Mac or Command Prompt on Windows and enter the following command to unlock the bootloader:
fastboot oem unlock
Step 5: Now we will flash the TWRP recovery. Run Terminal or Command Prompt and navigate to the Fastboot folder where the TWRP recovery image is placed. Enter the following commands:
fastboot flash recovery <recovery.img>
The custom recovery is now installed.
Installing the OxygenOS ROM
Step 1: Download the OxygenOS ROM from here and copy the file to the root of your phone’s storage.
Step 2: Now we need to enter recovery mode on the phone. Do this by holding down the volume down key + power button.
Step 3: Once in recovery mode, make sure you take a Nandroid backup. After taking the backup, do a complete factory reset of the phone.
Step 4: Now tap the Install button and look for the oxygenos_1.0.0.flashable.zip file to install it.
Step 5: Once the ROM is flashed, simply reboot your phone.
That’s it! You are now running the latest Lollipop OS based OxygenOS ROM on your OnePlus One.
Here’s an over-the-top run-down of some of the features which OxygenOS ROM comes with.