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The OP has said that they are using Windows 7, so the problem is not the Windows 10 update.
It sounds more like a cable or USB port fault, it is not uncommon for a damaged cable/port to still be able to be used for charging even though the data connection doesn't work.
If it is the port on the Kobo that has the fault then there might not be any complete solution, but as long as it still charges then sideloading using wi-fi or micro-SD will enable the device to continue to be used for reading.
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