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Sounds like the options&on starts the device in FEL mode. There is a special driver for that but I'm afraid, it will not give you the USB mass storage mode you are hoping for. With the limitation you have I guess repairing the device is beyond your abilities, since as far as I can see it, you need to solder 3 wires and use the UART port to try to get into it and even then I'm not sure this will lead to success.
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