@lancastergps
Are you absolutely sure it's now unable to access preboot? If you really can't find preboot it may be impossible to recover it. Are you starting with the devices fully OFF before you try to enter preboot? As it's stuck on the logo screen you'll need to force it off by holding the power button for 10 to 30 secs. Then hold UP, connect USB (press power button if it stays off). You can also try holding "Enter" instead.