[bedoig]

Agreed. The file explorer you are using on the phone is not set to show extensions. When you added .nbh, you were really changing the name of the file to titaimg.nbh.nbh.

Remove the .nbh that you added.

Edit: Also, the screen doesn't need to be off. You just have to make sure you hold both buttons while performing the reset. Usually a good idea to hold them for a second or two after you hit the reset button.