An HTC One smartphone is displayed in a mobile phone shop
[Representational Image] HTC One (M7) finally gets Android Marshmallow via CyanogenMod CM13 custom ROM [How to install] In Picture:A HTC One (M7) smartphone is displayed in a mobile phone shopREUTERS/Pichi Chuang

Leading custom ROM developer community, CyanogenMod released Android Marshmallow-based CM 13 series firmware to select smartphones way back in November 2015. Sadly, HTC One (M7) was missing in the list of eligible devices. Now, the v6.0.1 OS update has been made available to 2013 flagship phone.

It is around 342MB in size and brings Doze power saving feature, faster Chrome browser, more intuitive Now on Tap feature, new security feature verified boot system, support for more international dialects, a new contextual assistance feature and numerous other features to enhance user-experience on HTC One(M7).

We like to advise readers that this firmware is an experimental nightly version, so there might be some bugs. Device owners must exercise caution before going ahead with the installation.

Read more: Google Android 6.0 Marshmallow: 7 key features you need to know

Prerequisites (things to remember before installing Custom ROM)

  • Make sure the device is rooted before going ahead with custom ROM installation.
  • Make sure USB driver is installed in the PC or else your device (HTC One M7) will not be recognised by the computer.
  • Make sure your device has more than 80% battery, or else there is a chance of the tablet getting temporarily bricked if the installation process is interrupted midway.
  • This new CyanogenMod CM 13 Android 6.0.1 Marshmallow custom ROM series has to be installed on HTC One (M7) 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 to 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 13 Android 6.0.1 Marshmallow custom ROM on HTC One M7:

Step 1: After downloading the CyanogenMod CM 13 6.0.1 Marshmallow custom ROM nightly and Google Apps in to the PC, connect HTC One M7 to the Computer via USB cord.

[Scroll down to find the CyanogenMod's downloadable firmware files]

Step 2: Place Android 6.0.1 Marshmallow 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 user will 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 13: Tap 'choose zip from sdcard' and go to Android 6.0.1 Marshmallow 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 14: 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 M7) will take at a few minutes to complete the booting process.

Users then head to Settings >> select 'About phone' to confirm the installation of ) CyanogenMod CM 13 6.0.1 Marshmallow custom ROM nightly M.

Downloadable files:

HTC One (M7) CyanogenMod CM 13 6.0.1 Marshmallow custom ROM nightly: HERE (build date: 13/10/2016)

Recovery image: HERE

Google Apps: HERE

USB Driver: HERE

[Credits: CyanogenMod]