Hi,
If you are in the following configuration :
- Fingerprints not recognized anymore,
- Alternate fingerprint password forgotten or not recognized anymore,
- Your phone is rooted,
Just install Titanium Backup, and wipe data for the "Fingerprints" app from within TB. I just did that and was able to reset the fingerprint config very quickly and easily.
This will erase your previously recorded fingerprints, and the alternate password. A reboot may be required before beeing able to register new fingerprints.