Cannot be configured to factory setting in VE

This is by design, see solution Restoring the BIG-IP configuration to factory default settings

When you restore the BIG-IP configuration to factory default settings, the system performs the following tasks:

Removes all BIG-IP local traffic configuration objects
Removes all BIG-IP network configuration objects
Removes all non-system maintenance user accounts
Removes system maintenance user account passwords (root and admin)
Removes BIG-IP module data and policies
Resets the host name to the default value
Resets the local trust domain
Retains the management IP address
Retains the BIG-IP license file
Retains files in the /shared partition
Retains manually-modified bigdb database variables
Flags the Setup utility to run when the next user logs in to the Configuration utility

Thanks

BTW, Two VE together are in same vlan, first one can be accessed via management interface 10.10.10.12, but second one with management interface 10.10.10.11 cannot be accessed even if it is configured to factory config. we are sure management interface are configured correctly. what is wrong with second one? Thank you