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[How to] Upgrade HTC One M8 Dual SIM to Android M using CM13 custom ROM

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We have just told you how to install Android M on HTC One M8 via CyanogenMod 13 custom ROM. Now, it’s turn of the dual-SIM variant. HTC One M8 Dual SIM was launched back in June 2014. The smartphone has got almost the same specs as of its single SIM variant. The device has got 5-inches 1080p display. It is powered by 2 GB RAM and quadcore Snapdragon 801 processor. The primary camera is dual 4 MP while the front one is 5 MP. It has got 2600 mAh Li-Po battery. The phone has received Android 5.0 update. It will be getting Android M this year. However with CM13 custom ROM, you can get Android M right now on your device.

HTC-One-M8-Dual-SIM-Android-M

Let’s Get Started:

The guide is for HTC One M8d. 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 HTC USB drivers to establish the connection between your PC and smartphone. Download and install the latest HTC USB drivers from here.

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 HTC One M8 with custom ROM, you must have CWM recovery tool. Install the tool to enable the device to upgrade its OS via custom ROM. Click HERE to check out instructions to install CM13 on HTC One M8 Dual SIM.

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 HTC One M8 Dual SIM to Android M. 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 HTC One M8 to Android M via CM13 custom ROM:

  1. Connect your HTC One M8 Dual SIM 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 Down and Power buttons until boot menu appears, now navigate to RECOVERY using Volume keys and press Power key to select)
  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 M .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 HTC One M8 Dual SIM.

Your device will take approximately 5-8 minutes to reboot. Once restarted, you can enjoy Android M on HTC One M8 Dual SIM.

Hope you like the latest Android M build. Don’t miss to share the tutorial with your friends. As it is not an official build of Android M, 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.

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