CyanogenMod 12.1 ROM
Android One devices start receiving official CyanogenMod 12.1 Nightly builds: How to installYouTube

Owners of Android One are in for some great news, as some of these devices like the Symphony Roar A50 have started receiving the official CyanogenMod 12.1 Nightly builds via XDA recognised developer, varun.chitre15.

Symphony Roar A50 users with 4GB models (without emulated storage) and 8GB models (with emulated storage) can now download the latest builds of CM12.1 Nightly ROM via the official CyanoagenMod website.

Interested Android One users can go ahead and install the official CM12.1 ROM on their device, using the step-by-step guide provided below.

IBTimes UK reminds readers that it will not be held liable for any damage to device during or after the ROM installation. Users are advised to proceed at their own risk.

Pre-requisites

  • The instructions given in this guide are meant for Android One devices only.
  • Ensure the device 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 tablet setup. In Recovery, choose Backup and Restore and tap Backup
  • Verify correct USB drivers for the device are installed on the computer
  • 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 that its bootloader is unlocked

Downloads Required

CM12.1 Nightly Sprout4 for Symphony Roar A50 4GB (without emulated storage)

CM12.1 Nightly Sprout8 for Symphony Roar A50 8GB (with emulated storage)

Google Apps

Steps to install Android 5.1 based CyanogenMod 12.1 ROM on Android One devices

Step 1: Download and extract CyanogenMod 12.1 Nightly build and Gapps package files to the root folder on your phone's SD card.

Step 2: Then reboot the device into recovery mode as follows:

  • Power off the device and wait until it is completely shut down
  • Now press and hold Volume Up and Power buttons together until the device enters bootloader mode
  • Use Volume Up button to browse and highlight Recovery option, and then hit Volume Down to choose the option

Step 3: Perform Wipe Data / Factory Reset if you are upgrading from a non-CM ROM or some other custom ROM. Otherwise, just do Wipe Cache and Wipe Dalvik Cache to proceed.

Step 4: After the wipe process completes, return to main Recovery menu and choose Install Zip from SD card to begin the CM12.1 ROM installation process.

Step 5: Go to the location where you copied the downloaded files earlier and choose the CM12.1 ROM zip file.

Step 6: Confirm the action when prompted and install the ROM.

Step 7: Repeat steps 4, 5 and 6 to install the Gapps package as well.

Step 8: Once both the ROM and Gapps are installed, hit Reboot > System to restart the device.

The first boot after the ROM installation may be time consuming. So, do not interrupt the boot process and allow the device to boot up completely before displaying the initial setup screen.

That is it. You have now successfully installed and configured the official CM12.1 ROM for Android One.

[Source: XDA]