Today HTC One M8 get its first official Cm13 Nightly.You can download the official CM 13 rom for HTC One M8 from the link given below.Make sure to make backup of current rom before flashing it.
As the rom
is new and no one yet test it so we request your to test it out and
report in comment section.As this is first cm13 nightly there may be
bugs in it.I refer your to make backup of your current rom before flashing this rom.Lets start
the guide on How to install Official Cm13 rom on HTC One M8
#How to install Official CM13 rom in HTC One M8
1.Download official CM 13 nightly for HTC One M8 .and the appropriate Gapps 6.0 package
from link given below Copy it in your in your device.
2.Now place the Official Cyanogenmod 13 rom and gapps 6.0 zip file in sd card.
3.Now reboot to Recovery mode.
4.Then flash CM13 rom and Gapps 6.0 from recovery in it.
5.Now Clear cache and Clear Data.
6.Reboot your device.Done! you just flash Official cyanogenmod 13 rom in your HTC One M8
Enjoy Android Marshmallow 6.0 !.