Do NOT ... repeat ... DO NOT format your unit if you have no backup. At a MINIMUM, we need to find a map for your unit somewhere, either on the unit or on your PC. With that, we can do almost anything.
When you connect your 720 to your PC, can you still see it as a hard drive? If you can see it, please look into it to see if there is still a Western_Europe folder on the unit. If not, we'll have to see if there's one anywhere on your PC.
That's an interesting state of affairs. The initial USB negotiation between the host (your PC) and the device determines whether the device claims to be an external storage device and it is at that point that it is treated as such by the host via a USBSTOR driver, etc. That USB negotiation is managed by the bootloader, not anything in the unit's file system -- which is why you can format it and still have it function as an external storage device. Is it that the PC sees it as a corrupt external storage device (that I would readily understand), or refuses to deal with it at all? I'd be curious to know what USBDeview makes of it with the SD card removed. That utility doesn't require that there remain any sort of integrity to the file system at all, but will identify what the device claims itself to be.2. add an SDcard....
My Go720 has defunct internal memory and that's not recognised as a drive by my PC any more at all. But it works fine with everything dumped onto SD.
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