FORTUNE -- Having written twice about the problems I've had getting the iPhone 5S to recognize my scarred left thumbprint -- and to remember it two days later -- I'm happy to report that TouchID is working for me now.
I don't know whether to thank the "overtraining" trick I picked up a couple weeks ago or the iOS 7.1 software update that Apple (AAPL) released on Monday, but for me TouchID's reliability has increased significantly, from an unworkable 50% to close to 100%.
Your mileage may vary. In fact, some iPhone 5S owners are complaining on Apple's support site that for them, the update backfired. As of Wednesday morning, Touch ID doesn't work after iOS 7.1 Update had drawn 25 responses and more than 2,000 views.
To try to quantify the extent of the problem, how about a quick, totally unscientific poll?
That's the claim being made for the fingerprint scanner in the upcoming Galaxy S5.
FORTUNE -- Here's the challenge: To be incorporated as part of a regular start-up routine, fingerprint ID systems must be at least as easy and dependable as the pass codes they are meant to replace.
Which is why I finally gave up trying to use Apple's (AAPL) TouchID system on my iPhone 5S.
Not that I'm a good test case. After 64 years of paper cuts, MOREPhilip Elmer-DeWitt - Feb 18, 2014 11:24 AM ET
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