If this does not work, try changing the init.ora parameter REMOTE_LOGIN_PASSWORDFILE to NONE rather than EXCLUSIVE. This should allow you to connect as SYSDBA or SYSOPER without a password to start the database. At this point, you can recreate the password file, change the init.ora parameter back to its original value and then change the password for SYS.
With respect to your problem using DBCA, check in $ORACLE_HOMEassistantsdbcalogs for a log file. If DBCA is failing, it will usually create a log in this location.
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