Step 3, USB Drive is blank

i tried formatting the usb drive with exfat, fat32, and ntfs and its still bank, even tried downloading the usb sd creator on another computer and its the same prob. im very new to this, i have not turned on my box in a while, maybe month or two, nothing was working and a bunch of errors popped up. couldn't find any movies. figured i do a factory reset. (extremely bad idea) now the box boots up to the flash screen like installing a new rom on a android phone. if someone can take the time and help me out and walk me through the steps i would appreciate it very much, thanks in advanced