Seafile migration/downgrade


I needed to migrate a seafile installation (6.3.4 64bits) from one physical server to an other which was supporting only 32bits app.
So I installed an old seafile release that was supporting 32bits (6.1.2) and I migrated data and database on to that other server.
Basic functions are working fine but I have some issues like creating new user, creating new Repo because the MySQL schema in 6.3.4 is quite different to the one expected in 6.1.2.

Is there a way to downgrade the MySQL database schema?