Hello Rafael,
1)
Explanation for error code -4001: Unknown user name/password combination in operational state ADMIN
Explanation
The specified combination of user name and password is unknown in the operational state ADMIN. Access to the database system is only possible with the firstDBM user.
You can create several users of type DBM. But, during the database installation the so called first DBM operator is created. User name and password of the first DBM operator are specified during the installation.
2)
From the output you attached for "select * from users" it is clear that the CONTROL user is not the
first DBM user.
Control user was created on 2007/08/17
Superdba on 2012/06/07
SAP<SID> user on 2005/07/25
3)
You can correct a lostfirst DBMproperty with the command below:
dbm_configset SAPDB12 CONTROL
4)
Restart and try the upgrade again.
Regards,
Yashwanth