Any way to hard reset a HDC A9100?
Have you tried the standard Android hard reset? I heard this works for all Android phones.


turn it off (if you cannot shoot it down, remove the battery).
hold both volume-buttons and the home-button and then hold the  power button. about 5 seconds


use this at your own risk! You will lose all your installed data and get a clear reset to shipping settings, if it works.

there are some videos about it on youtube.