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[How to] Upgrade One Plus One to Android 5.1.1 Lollipop using SOKP custom ROM

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One Plus One is a high-end flagship from a Chinese manufacturer. The handset got popularity due to its real powerful hardware and specs at par with giants like Samsung, LG and HTC. The handset features 5.5-inches display with 13 MP camera and 3 GB RAM. The handset packs powerful 3,100 mAh battery. The handset runs on Android 4.4.2 KitKat. The handset has received the Lollipop 5.0 update. However, there are no words on when it will be getting Android 5.1.1 update or will move straight to Android M. Considering this, a new ROM named ‘SOKP’ is here that enables you to upgrade One Plus One to Android 5.1.1 Lollipop.

One-Plus-One-Android-5.1.1

Let’s Get Started:

The guide is for One Plus One only. Don’t try the guide on any other model as it may cause the device to brick. In order to check out the variant of your device, head to Settings > About.

Create Backup:

One surely don’t want to lose the contents of your device. Therefore, it’s better to back up your device before performing the operation. It will also help you to revert back in case of any issues while upgrading. In order to perform the backup, click on this link,

Install USB Drivers:

You should have latest USB drivers to establish the connection between your PC and smartphone. Make sure to download and install latest USB drivers.

Enable USB Debugging Mode:

Make sure to enable USB Debugging mode on your device. This can be done by heading to Settings > About and tapping 7 times on build number to enable Developer’s options. Afterwards, head to Developer Options to enable the USB debugging mode.

Install ClockWorkMod Recovery tool:

In order to upgrade One Plus One with custom ROM, you must have CWM recovery tool. Install the tool to enable the device to upgrade its OS via custom ROM.

Sufficient Battery:

Also, make sure to have sufficient amount of battery in your device. More than 80 percent battery life is recommended for continuous and smooth operation.

Files Required:

You need to download these two files in order to upgrade One Plus One to Android 5.1.1 Lollipop. The files will be in compressed format. DO NOT EXTRACT them as CWM recovery tool will be using .zip files. Here are the required files:

Methodology:

The whole guide is based on these two steps; booting the device via Clockwork Mod recovery tool and then flashing the custom ROM through it.

Steps to upgrade One Plus One to Android 5.1.1 Lollipop via SOKP custom ROM:

  1. Connect your One Plus One to PC via USB cable.
  2. Move the downloaded files to the phone’s SDcard root.
  3. Switch off your device and disconnect it form the PC.
  4. Boot your device in CWM recovery mode. (Press and hold Volume Up, Power and Home buttons to do so)
  5. Now, tap on ‘wipe data/factory reset’ option. (Use Volume keys to navigate and Power keys to select options)
  6. Select ‘wipe cache partition’ to clear the device memory.
  7. Now, navigate back to CWM recovery and choose ‘Advanced’.
  8. From ‘Advanced’ option, tap on ‘wipe dalvik cache’. This will avoid any future loop issues.
  9. Head back to CWM recovery and tap on ‘install zip from SDcard’ option.
  10. Select ‘choose zip from SDcard’ and choose the Android 5.1.1 ROM .zip file.
  11. Wait for the installation process to complete.
  12. Once completed, head back to CWM recovery and tap on ‘install zip from SDcard’.
  13. Now, tap on GApps in order to install all Google apps in the newly installed custom ROM.
  14. Once done, simply restart your One Plus One.

Your device will take approximately 5-8 minutes to reboot. Once restarted, you can enjoy Android 5.1.1 Lollipop on One Plus One.

Hope you like the latest Android 5.1.1 build. Don’t miss to share the tutorial with your friends. As it is not an official build of Android 5.1.1 Lollipop, your device may come across performance and other issues. If you gets tired of the buggy experience, you can simply move back. In order to revert back to previous OS, boot your device again in CWM recovery. Tap on ‘backup and restore’ and select the previous available ROM backup to revert back.

For more information, you can visit this XDA source thread here.

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