be sure to run as admin the USB burning tool , here is the steps:
1. load the .img file
2. click the start button
3. toothpick the reset button of your box
4. put the power plug together with tootpick then you will see it will be connected
5. release the toothpick
6. wait to finish the upload of file to your box (around 2mins.)
7. press stop button and unplug the USB to your box
note: donot use your PS when using USB burning tool
regards,
kabise