I have tried to recover lost password of system user but unable to recover.
$ ./cypher-shell -d system
Connected to Neo4j 4.0.2 at neo4j://localhost:7687 .
Type :help for a list of available commands or :exit to exit the shell.
Note that Cypher queries must end with a semicolon.
@system> ALTER USER system SET PASSWORD 'neo4jsys';
Failed to alter the specified user 'system': User does not exist.
Please let me know that how rcover system user password.