&gt; <i>&quot;Copying a good fingerprint from a dead finger or a randomly placed print is not easy [2]. It&#x27;s hard, doable but you get 5 tries so if you screw up, you have thrown away all the hard work of the print transfer.&quot;</i><p>You get plenty of tries to perfect the technique, before using it on the actual device.<p>You acquire identical hardware and &quot;dead finger countermeasures&quot; <i>(does the iphone employ any?  Some readers look for pulses and whatnot, I don&#x27;t know if the iphone does)</i>.  You then practice reading the fingerprint on that hardware until you are able to reliably get a clean print and bypass any countermeasures.  Only then do you try using the finger on the target phone.<p>You might still fuck it up, and you only get 5 chances on the target hardware.   But with practice on the right hardware, I see no reason why you couldn&#x27;t get it.