HTC One M8 phones can still download a custom version of Android 6.0.1 Marshmallow using the S.Team custom ROM. S.Team custom ROM brings in full HTC features like Sense 7.0 and One A9 goodies.

HTC One M8 just received custom support for Android 6.0.1 Marshmallow via S.Team despite it already being up for the official update. S.Team best comes with Sense 7.0 user interface for a more complete HTC user experience, plus goodies that were originally ported from One A9 phones.

Before installing Android 6.0.1 S.Team 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.

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

1.      Download S.Team 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.