I asked the same question HTC suppo

I asked the same question HTC support, I sent them a picture too, and here is answer:

Dear xxx,

Thank you for contacting HTC

Would you please try the Soft Reset :
Remove the battery, then re-insert it.

Note: Soft resetting your phone deletes all unsaved data.

if it didn't work try the factory Reset :
Notice: Make sure you have a backup of the data, if possible

While the phone is off, press& hold on the Volume Down button, press the power -while the volume down is still pressed-

Release Volume down, then follow the on-screen steps.

Note: A screen with 3 Androids will come up, Press VOLUME DOWN to select CLEAR STORAGE, and then press POWER. When asked to confirm, press VOLUME UP.