We have already shared with you a few Android 6.0 Marshmallow based custom ROMs for HTC One M8. S-ROM was, however, one of the first ROM based and Android 6.0 Marshmallow and Sense 7.0. A very stable custom firmware, here is how you can update HTC One M8 to Android 6.0 based S-ROM.

-Show Battery Percentage and Configure Quick Settings – Android 6.0 Marshmallow Tips

S-ROMAndroid 6.0 Marshmallow custom ROM:

Based on HTC A9 1.10.401.7World’s first Marshmallow Sense 7.0_g A9 port for HTC One M8Include latest A9 framework, drivers, and modulesSupport all models, include CDMA modelsRock solid, super fast

Note:Custom ROMs are third-party firmware which means theremight be some performance issues with some features. They also void your device's warranty; please proceed at your own risk.

Prerequisites to update HTC One M8 toAndroid 6.0 Marshmallow ROM:

Backup any important datafrom your HTC One M8 as a complete wipe will be required during the flashing process.Install USB drivers for your HTC device. Check outthis link.Enable USB debugging option on your device:Settings>DevelopmentOptions>USB debugging.Ensure that yourHTC One M8's bootloader is unlockedand that you have a recovery tool likeTWRPor CWM.Your device must be charged to at least 80% of power.

How to update HTC One M8 to Android 6.0 S-ROM:

Required files:

DownloadS-ROMAndroid Marshmallowcustom ROMfor HTC One M8.

Here are the steps to help youupdate HTC One M8 toAndroid 6.0 MarshmallowbasedS-ROMcustom firmware:

Connect yourHTC Oneto your computer using a USB cable and copy the ROM file to your phone’s SD card root folder.Also copy and paste theboot.imgfile toandroid-sdk-windows\platform-toolsdirectory.Disconnect theUSBcord andpower off your HTC One M8.Boot your device in the Bootloader mode by pressing and holding theVolume DownandPowerkeys.Once in Fastboot mode, navigate toandroid-sdk-windows\platform-toolsdirectory on your PC and open Command Prompt (Shift+Right-click>Open Command Prompt).Type the following command:Fastboot flash boot boot.img- pressEnter.fastboot reboot -pressEnter.Follow the onscreeninstructions on your phone. SelectBootloader>Recovery.Once in recovery, perform wipe data tasks: from the recovery menu, selectwipe data / factory resetand confirm the process.Also performwipe cache partitionfollowed bywipe dalvik cache(from Advanced).From recovery main menu, selectinstall zip fromsdcardfollowed bychoose zip from sdcard.Locate the Android 6.0 Marshmallow S-ROM custom firmware file and confirm the flashing process.Return back to main recovery menu and reboot yourHTC One M8into the new custom ROM.

That's it. Enjoy the features of Marshmallow and the stability of S-ROMcustom ROM on yourHTC One M8.