Master server is down, or removed, how to state a slave server to be master without losing its configuration?

If the slave server still has clustering configuration of master server, please follow the directions below to change the server status.

SSH ROOT access to slave server
remove file /home/rvadmin/_rvconfigmultserver.conf
remove file /home/rvadmin/multiserver.conf
If this server has been setting with RVSkin default database by master, you need to configure RVskin default database at slave by accessing to WHM -> RVglobalsoft Manager -> Theme Manager -> Config -> Database Setup.

This will replace slave status with master, including retaining its configuration.