Hi, I had the same problem. I contacted HTC and was told to With your phone turned on (you can also turn off your device if you like by pressing on power button once; then select “turn off”) press and hold volume down and home buttons together.
Keep pressing the mentioned keys until the screen goes black.
At that point release only the power button but keep pressing the volume down key.
Fastboot mode will be then displayed, so you can also release the volume down button.
In fastboot mode use volume down / up buttons in order to scroll up or down towards the menu.
Choose recovery option.
Your phone will show a black screen with a triangle for a few minutes then it will reboot. It has solved my problem, hope it works for you.