OnePlus One phones can now be updated to Android 6.0.1 Marshmallow using a custom ROM developed through the Android Ice Cold Project (AICP). The ROM brings the Vanilla user interface and some tweaks and improvements to make the phone stable throughout the Marshmallow experience.
There is no official Android 6.0.1 Marshmallow update yet for OnePlus One as of this time, but the update can still be installed on the device using the AICP software. The custom ROM based on the latest Android build has already been made available to other phones like Samsung Galaxy S5.
Particularly, OnePlus One variant eligible for the update is known as Bacon. According to Team Android, the custom build brings a host of customization options on top of the Android AOSP user interface, called Vanilla. Aside from which, the AICP ROM also offers new tweaks and improvements, plus a more stable performance.
It is highly recommended to back up all necessary data stored on the phone, including the downloaded apps, since installing the ROM will clear all memory spaces of the device. Charge up the phone to at least 80% to prevent power interruption which might cause damage on the phone.
Before deciding to download and install the ROM to the phone, here are a few things that should be done:
1. Never try the ROM on other versions or models.
2. Download and install USB driver for this version.
3. Enable USB debugging mode from developer menu.
4. Download and install a custom recovery tool on the phone like CWM or TWRP.
5. Back up necessary data.
To begin with the update, here are simple steps:
1. Download the AICP Android 6.0.1 Marshmallow ROM here.
2. Download the Google Apps here.
3. Press hold simultaneously the volume +, home and power buttons to restart phone into Recovery mode.
4. Perform Nandroid backup of the existing ROM. This will allow users to get back to the original software version once ROM is updated. To do this, go to Backup and Restore > Backup again. Once back is complete, go back to main recovery menu.
5. Choose "Wipe data/factory reset". Tap "Yes" to confirm action.
6. Once completed, go back to CWM recovery menu > Wipe Cache Partition > Wipe Dalvik Cache.
7. Tap Select Install zip from sdcard > Choose a zip from SD card. Find the downloaded AICP ROM and select it by pressing the power button. Tap "Yes" to confirm action. Installation shall begin.
8. Once completed, go back to third step to install the Google Apps.
9. Once completed, go back to the main recovery menu. Select "Reboot system".
Once completed, the phone should now be in Android 6.0.1 Marshmallow. To check the software, go to Settings > About phone.
