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(SOL3350) Changing root and support passwords
To reset a lost or forgotten root or support password, perform the following procedure:
Important: Due to a known issue, in BIG-IP version 10.1.0 the passwd utility cannot be used to change the root password when the system is running in single-user mode. For more information and to obtain an alternative procedure, refer to SOL11190: The passwd utility fails to update the password for the root user when a connection to the MCP daemon cannot be established.