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SR10 firmware upgrade failure

I have tired to update the firmware on my SR10 and the Sena bluetooth manager recognises the unit and tells me that I can update the firmware from V3 to V5.1, however, the progress gets to 9% and it will not go any further. I have left it all night but it will not go past 9% and I have tried a factory reset but to no avail. Is there anyone who can help pleae?

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