HTC One M8 phones can still download a custom version of Android 6.0.1 Marshmallow using the Blues firmware. Blues custom ROM brings in features Aroma Installer, custom kernel for improved performance and recovery options.

HTC One M8 just received custom support for Android 6.0.1 Marshmallow via Blues ROM despite it already being up for the official update. The ROM is made for those who want a personalized take of the build.

Before installing Android 6.0.1 Blues ROM, take note of the following reminders and prerequisites:

• Use only HTC One M8 as prescribed. Using other phones or models may cause irreparable damage on the phone.
• Make sure phone is rooted.
• Custom update requires custom recovery to flash ROM zip file on the phone.
• Unlock bootloader first.
• Install a USB driver here.
• Back up all data.
• Installing any custom ROM induces risk of damage on the device. Neither this site nor developers of the Blues ROM will be held responsible for such damage.

Here is a quick and easy guide to install Android 6.0.1 Blues on HTC One M8:

1.      Download Blues on PC and extract boot.img from the zip file separately.

2.      Connect device to PC using a USB cable.

3.      Copy downloaded file from PC then paste to phone's SD card root.

4.      Copy boot.img file then paste to android-sdk-windows\platform-tools directory.

5.      Switch off device.

6.      Go to the Bootloader Mode by press holding volume up button while connecting it again to PC using a USB cable. The device's LED shall turn blue as it gets into Bootloader Mode.

7.      When in the Fastboot Mode on the phone, go to android-sdk-windows\platform-tools directory on PC and open Command Prompt by doing shift + right click + open command prompt.

8.      Type fastboot flash boot boot.img then press Enter.

9.      Type fastboot reboot then press Enter.

10.  Go to Recovery Mode. Turn on device by pressing volume up and down buttons a few times until LED light turns into a different color.

11.  When in ClockWorkMod (CWM) Recovery, press "wipe data/factory reset" using the power button to navigate.

12.  Press "wipe cache partition".

13.  From CWM Recovery, go to "advanced" then press "wipe dalvik cache".

14.  Go back to main recovery screen and press "install zip from SD card".

15.  Press "choose zip from SD card". Use the volume keys to navigate to Max Fury then press the power button to choose it.

16.  Confirm installation and wait until it is completed.

17.  Once completed, go to +++++Go Back+++++ and choose "reboot system now".

To check for the new software version, go to Settings > About phone.