I assume it never actually finished updating the firmware. If so, that is why it s not seen by the computer, these types of devices have to be running for that.
The fix should be to do a factory reset. This can be done using the buttons, but I can never remember the method for the WiFi. A search here should find it. If that doesn't help, then restoring an image to the internal SD card will probably fix it. I can send you a PM with the link, but you need to enable PMs for your account.
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