Option 1
Set profile parameter 'login/no_automatic_user_sapstar' with value '0'
This will allow you to reset sap* password. Do not forget to stop/start
your sap system in order to take this parameter into account. When
restarted, you will be able to login within default password 'PASS'
Option 2
Run the following report from a client you can logon to.
Either from SE38 in a client where ABAP development is available,
transport the report or use the function module
'RFC_ABAP_INSTALL_AND_RUN' and put the report in the program
table and enter debug with replace to remove the SAP checks.
Report t.
Tables: USR02.
Select single * from USR02 where bname = 'SAP*'.
usr02-mandt = '000'.
Modify usr02 client specified.
