I suppose it can support 8.1 because it support windows 8, but it does not.
When the boot screen display a circle (seems like it begin to load something), the board halt on there.
What's going on?
Are you using the official Windows image downloaded from Microsoft website provided by the contest committee? Is there any error during the system installation?
Please press 'del' key to enter bios setup ,and press 'F9' to load bios default value,and then press 'F10' to save,try to install windows8.1 again