[M110] Cannot access USB/Micro SD/Internal Storage

Hi I wish someone could help me here:

I was updating M110 firmware to the latest version today and the first step (flashing projector FW) seemed okay. However, then I tried to update the media FW according to the instruction, i.e. copied the media FW files to the root directory of a micro sd card and launched the updating process through OSD. Now when I found the upgrade screen and choose "confirm", the "update status" screen did show up but the progress indicator remained at 0%. 

I waited for about 20 minutes and nothing happened, and despite what key I pressed, the screen seemed frozen. So I made a maybe stupid decision of switching off the power and restarted the projector. Alas, I could not access USB/Micro SD/Internal Storage menus anymore. I mean for any of the above three input options I chose, there was only indications of "no signal", regardless of what card/USB I inserted. This had never happened before.

The USB port didn't seem to damage, as when I put the projector to "download mode" (press and hold menu and hold keys to have two yellow lights on) and plugged an A-A USB cable, my laptop still recognized it.

I also tried to make a factory reset but didn't solve the problem.

Could anyone help provide a solution? I don't use those functions quite much but just in case... Many thanks!