I bought the MK802 III through eBay and received it today. After some fumbling around with the device, I managed to get it working on the TV, through connecting the device to both the HDMI and USB ports on the TV.
After I was done, I clicked the power button on the Air Mouse that came with it, and it appeared to go to some sort of "screen off" mode.
I then left for some other business, and when I came back, the device was completely shut off, and pressing the power key did nothing.
I've tried various solutions such as checking different HDMI and USB cables, connecting to an electrical outlet instead of a TV, connecting the device directly to the HDMI slot in the TV without a cable and even checking all of those on a different TV.
It appears that I've somehow, without doing anything, bricked the device, as far as I can tell.
After that, I've also tried download the firmware update on an SD Card, but then I noticed that you actually need to connect the device to a TV and see the dialog window to download the firmware update if your device isn't working. Really?
Also, why isn't there any hard-reset button on the device? Nearly all of the cheapest MP3 and MP4 players have a little reset button, unless I'm missing something.
I don't mean to bash at the device, because for the little time that I had it working, I enjoyed it quite a bit, but I don't see how doing nothing can kill the device.
I'm not really interested in soldering or welding the internal parts of the device, because I'm planning to return the device as new as possible if there's no solution that doesn't require tearing the device's guts open.
I'm hoping there's a way to apply the firmware update without a TV, or fixing the problem without updating the firmware, unless the device needs to be shipped back to the seller.
I will appreciate any help on this matter