Convert a Device to Multi-Instance Mode
Use this procedure to convert a device in the management center to multi-instance mode. The conversion takes approximately 15 minutes. The system reboots and, as part of changing the mode, erases the configuration with the exception of the Management network settings and the admin password. The chassis hostname is set to "firepower-model." The Management IP address is assigned to the chassis for the management connection with the management center. When you add instances, they will use separate IP addresses on the Management interface and maintain their own management connections.
After you convert to multi-instance mode, you can use the management center to configure all chassis settings as well as instances. The Secure Firewall chassis manager or configuration at the FXOS CLI is not supported.
Before you begin
Add the appliance-mode device to the management center as a standalone device. This device cannot use:
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A data interface for manager access
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DHCP for the Management interface
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Zero-Touch Provisioning
Procedure
Step 1 | On , next to the device you want to convert to multi-instance mode,
choose More ( 
You can alternatively check the check-box next to multiple devices that you want to convert, and choose . 
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Step 2 | Confirm that you want to perform the conversion and click Continue. 
A readiness check is performed. The check might fail if, for example, a deployment is in progress. | ||
Step 3 | Optionally change the name of the chassis, and click Convert to Multi-Instance. By default, the device name is used, but you may want a different naming convention for multi-instance chassis.
Wait for approximately 15 minutes, during which the device is removed from the device list, and then after conversion, it is re-added as a chassis. | ||
Step 4 | To view and configure the chassis, click Manage in the
Chassis column, or click Edit ( The Chassis Manager page opens for the chassis to the Summary page. 
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to rerun the readiness check so you can continue.