I tried to update but at 25 percent I get a red triangle. I have cleared cache and also did a complete reset but I still have the same issue. Any suggestions?
If I remember correctly the M8 & M9 had to have at least 20-24 gb available before they'd update. At least in my case. Maybe try freeing up storage, or using the HTC Sync tool on a PC to update.
I am having an issue as well. I recall having less space on there, and I was able to install previous versions.
Not sure if this is in relation to this, but when I was trying to get into recovery mode, the same screen popped up. Once I got past it, I saw this error listed on the bottom, "E:Fail to open file: /sys/devices/platform/android_usb/host_mode".