Reset superdba password for MAXDB

Hello

After migrating a sapdb instance (7.3 system) to maxdb 7.6 I have problems with the superdba and the control user.s The password that I think they should be the right do not work.

Now I'm looking for the possibility to reset the password of superdba and/or control user.

Please do not send me the notes

25591 - Changing the DBM, SYSDBA and DBA user passwords

and

39439 - XUSER entries for SAP DB and MaxDB

as done in many other SDN threads. This doesn't work for me because you can change the password only if you know the actual password (standarlogins superdba/admin and control/control do not work btw).

Does anyone know how to reset those passwords?

Thanks and regards

Marco