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VERY IMPORTANT NOTE: I had the same issue that a lot of people have been having where it was not recognizing my device in fast boot mode. The mistake I made was I was trying to update the usb driver when the phone was on. Then, I tried updating/downloading the driver when the device was in fast boot mode. This ended up working and it was able to recognize my device, update the software, and calibrate/fix my fingerprint reader. Hopefully this helps!!