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The USB will not be recognized until the unit boots to the main screen. This is where the subroutine scans for the insertion of the USB cable. In order to fix this problem, you have to access the flash drive directly, bypassing the standard boot-up. The drive must be properly formatted, otherwise the Nuvi can not write to the flash drive on boot-up and will either go into a boot-up loop or stay stuck at the Garmin logo. Accessing the flash drive must be accomplished in pre-boot mode. there are several programs out there that can do this. Once the drive is properly formatted, the unit will boot, create the Garmin folder, write a few other folders and files and boot-to the main menu. Now, you can connect the cable as usual and start copying over your backed up files. I've repaired this issue many times.
Check to see if this is a power issue by connecting to shore power and fully charging your batteries overnight with instruments off. While still connected to shore power, with batteries fully charged, turn on C80 navigation system. If the loading screen comes on and does not reset, then try holding down the button immediately to the right of the red power button for at least 3 seconds to see if the system re-boots.
Press the reset button - you'll find it on the lower right of the Nüvi
255, but it doesn't look like a button. It's basically the sticker with
all the information on it. It's just enough to push the sticker
carefully with something small, not too sharp so it doesn' get
destroyed. The Nüvi reboots, the loader loads and proceeds with the
software load. Once this is over, shut down the Nüvi and reconnect to
the PC. Then, everything works fine (it did at least for me).