In September 2020 I bought the Galaxy Book Flex and have been using the fingerprint scanner until recently. I had to send the laptop in for a screen replacement, so I turned off the Fingerprint scanner for sign-in so the technician didn't have any issues (or thought I did.....) when I received my laptop back Thurs, 2/18), the fingerprint was back on and working until Sat afternoon 2/20). Went into Device Manager and found this:
"Currently, this hardware device is not connected to the computer. (Code 45)
To fix this problem, reconnect this hardware device to the computer."
After looking into the event logs, the scanner has had multiple errors since Dec 2020. I have checked for updates both through Samsung updates and Microsoft updates and there aren't any - the latest is July 2020. There was a critical error yesterday - "The device CanvasBio Fingerprint Driver (location Port_#0005.Hub_#0002) is offline due to a user-mode driver crash. Windows will attempt to restart the device 5 more times. Please contact the device manufacturer for more information about this problem."
While I'm not using the Windows Hello Face, this also impacts this and doesn't show a compatible camera.
It is possible that the connector is loose after the hardware repair especially if it's not on an embedded chip. If you try reinstalling the drivers and it doesn't fix the problem, then it needs a hardware fix (opening it up again).
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