As well as the problems everyone has been having with the fingerprint scanner, the option to register/reset scanner has now completely disappeared from the settings. 

Only a few days ago I had re- registered my fingerprints and it was working reasonably well again. 

But now, it has stopped working completely and under 'security' the only option I now have is 'screen lock' so I have no way of resetting and re registering my fingerprint. 

Aside from trying a factory reset which I am loathe to do, is there anything else I can do to bring this back?

I am not very tech savvy either. 

Many thanks.