A fingerprint cannot be used as a hash to encrypt keys. All you can do is store some data and compare the fingerprint to see if there are enough matches. That is why secure fingerprint systems always involve some ‘secure’ hardware that stores and compares the fingerprint to the stored data and then releases some key.

Systems that try to do this in software are always trivially circumvented because you can just change the software to allow ‘not enough matches’ instead of ‘enough matches’. The key is necessarily in the device and software can’t protect it.