Chou shows the new HTC One M8 phone during a launch event in New York
[Representational Image] Update HTC One (M8) with Android Nougat via CyanogenMod [unofficial] CM 14.1 custom ROM [How to install] In Pictiure: The new HTC One M8 phone during a launch event in New York March 25, 2014.REUTERS/Brendan McDermid

A couple of months ago, HTC officially stripped the HTC One (M8) of the flagship status by disbanding it from software update service list.

With the announcement, HTC One (M8) users, who had hoped to experience the new Nougat, will have to stay content with the old generation Marshmallow OS for the rest of the device's life span.

That being said, HTC One (M8) owners would still be able to experience Android 7.1 OS by installing custom ROMs, which are found in abundance on the internet.

Among them, CyanogenMod is the most popular. A developer community who goes by the moniker Android-Addicts has come up with a firmware for the 2014 HTC One device.

Do note that this CyanogenMod CM 14.1 custom ROM is an experimental version and might contain some bugs. So readers should go through the entire tutorial to assess the risk and then go ahead with the installation procedure.

Also read: Android 7.0 Nougat released: 16 key upgrades of Google's new mobile OS update over Marshmallow

Prerequisites (things to remember before installing Custom ROM)

  • Make sure the device is rooted before going ahead with custom ROM installation.
  • Make sure the USB driver is installed in the PC or else your device (HTC One M8) will not be recognised by the computer.
  • Make sure your device has more than 80 percent battery, or else there is a chance of the tablet getting temporarily bricked if the installation process is interrupted midway.
  • This CyanogenMod CM 14.1 Android v7.1 Nougat custom ROM series has to be installed on HTC One (M8) GSM model only, if tried on other devices, it might brick them [to check your device model: Go to Settings >> About phone >> model number].
  • Though installing custom ROM improves the device's performance and UI experiences, it makes the company warranty void; the company will no longer be liable to provide updates in future [users can restore warranty by flashing the device with stock-ROM].
  • Installation of custom ROM requires clearing memory in the phone, so make sure you back all the data by installing Clockwork Mod (CWM) Recovery/ TWRP in the smartphone.

[Disclaimer: This procedure is very technical and should be performed by a person with sound knowledge of rooting (or manual software installation) Android devices. If the step-by-step installation process is not followed properly, there are chances of the smartphone getting bricked or being permanently irreparable. IBTimes India cannot be held responsible for any damage or claims from readers if the procedure does not yield the required results or if the smartphone is bricked. Hence, users are advised to proceed with caution.]

Step-by-step installation procedure of CyanogenMod CM 14.1 Android v7.1 Nougat custom ROM on HTC One M8:

Step 1: After downloading the CyanogenMod CM 14.1 Android v7.1 Nougat custom ROM and Google Apps on the PC, connect HTC One (M8) to the Computer via USB cord.

[Scroll down to find the downloadable firmware files]

Step 2: Place Android 7.1 Nougat custom ROM zip file and Google Apps file into the phone's SD card memory. [Note: Users are advised to paste the .zip file in SD card root, not in any other folder.]

[Note: Before installing the custom software, be sure that the device must have been rooted and has installed ClockworkMod Recovery tool.]

Step 3: Place boot.img file in the android-sdk-windowsplatform-tools directory

Step 4: Turn off the device and disconnect from the PC.

Step 5: Perform the regular Bootloader mode sortie, by press holding 'Volume (down)', and 'Power' buttons.

Step 6: After entering the Bootloader mode (on the phone), go to android-sdk-windowsplatform-tools (on the PC) and open Command prompt and type in: 'fastboot flash boot boot.img' and press enter.

(To enter Command prompt: Shift + right-click >> open command Prompt)

Step 7: Type: 'fastboot reboot' and follow instructions displayed on the screen. Select BOOTLOADER option to enter Recovery Mode

Step 8: Once entering the Recovery mode, clear the phone memory, by choosing 'wipe data/factory reset'

[Note: use Volume keys to navigate and power button to select options, while operating under Recovery Mode]

Step 9: Clear the cache memory by selecting 'wipe cache partition'.

Step 10: Return to the ClockworkMod recovery, and select 'advanced' and tap 'wipe dalvik cache' [Note: This step is optional, but many recommend this procedure so that the user does not face boot loops or any other errors in the middle of custom ROM installation]

Step 11: Navigate back to the main recovery screen and then tap 'install zip from SD card'

Step 12: Tap 'choose zip from sdcard' and go to Android 7.1 Nougat ROM .zip file in SD card and enter the installation process. Repeat the procedure for installing Google Apps [Note: use 'Volume' keys to navigate and 'Power' button to select options]

Step 13: Once done with the installation process, navigate to '+++++Go Back+++++' and re-start the device by opting 'reboot system now' seen in the recovery menu.

Now, your device (HTC One M8) will take a few minutes to complete the booting process.

Head to Settings >> select 'About phone' to confirm the installation of CyanogenMod CM 14.1 Android v7.1 Nougat custom ROM.

Downloadable files:

HTC One (M8) Android v7.1 Nougat-based CyanogenMod [unofficial] CM 14.1 custom ROM: HERE

Google Apps: HERE

USB Driver: HERE

[Credits: XDA Developer Forum]