Select ‘advanced’ and tap ‘wipe dalvik cache’ after going back to ClockworkMod Recovery. This is not a mandatory option but it is highly recommended if you do not want to face any boot loop or other errors. Now tap ‘install zip from SD card’ after returning to the main recovery screen.
Go to the Android Marshmallow ROM.zip file in the SD card and by tapping ‘choose zip from SD card’ and then begin the installation process. Repeat the same procedure for Google Apps as well then navigate to ‘+++++Go Back+++++’ and re-start the device by opting ‘reboot system now’ seen in the recovery menu after the installation process is complete.
Your HTC One M7 will take a few minutes to complete the full booting process. Meanwhile, 2015 is almost complete and people are starting to expect a new HTC device to be launched next spring in 2016.
HTC has been following a predictable pattern by releasing an early year flagship followed by a late year secondary device. The same pattern was seen in devices from HTC One M7, followed by One Max, M8 and Desire Eye and M9 along with One A9.
Stay tuned for more updates and information on HTC One M7!