Today HTC Desire Eye & Desire 816 are getting Android Marshmallow update. Here are the details:
HTC DESIRE EYE(M910X):
Android 6.0 update was rolled out to HTC Desire Eye (M910x) (Taiwan). ROM version is 2.20.709.3. Update weighs 275.73 MB download.
HTC DESIRE 816 (TAIWAN):
HTC DESIRE 816 also getting Android 6.0 in Taiwan. Software version number is 2.34.709.4 and update weighs 268.84 MB.
Both devices are getting Android 6.0 and thus all Android 6.0 features like App permissions, Google now on Tap, Android Monthly security patches, intelligent power management, Doze as well.
You can see full Android 6.0 update eligible devices list & update release dates & features By clicking here.