My father found an mp3 player on his delivery route Friday, and he gave it to me. I got it working, but after I deleted some music files off of it while it was plugged into my pc, the thing quit working... a message on the player's screen read 'UPGRADER' and wouldnt work anymore. Now the pc won't even recognize it at all. I think I may have deleted some critical files off the player itself that are required for it to run. It's a Motorola m25 player. Anyone have any solutions?