Switch SSHA256 to BCrypt

Hi, Can I in an existing application and 1K+ users switch the hashing algorithm from SSHA256 to BCrypt? Obviously I can change it in the model, but will it work in the end? Is it technically possible at all without knowing the plaintext password?   Regards, Paul  
1 answers

Anwering my own question:

Why not create a test project? The password is stored with a hashing algoritm hint in the database. Existing passwords stay intact but new and updated passwords are hashed with the selected (see Settings - Hash algoritm) password.

So it works fine to change the algoritm but existing passwords are not updated automatically. And I think that the latter is not possibele at all.