The rollback of the system will result in the rollback of the SE(s) followed by the rollback of the NSX Advanced Load Balancer Controller.
Use the following CLI and REST API for performing rollback for a patch version for the NSX Advanced Load Balancer system (Controller and SE groups).
Using the CLI
[admin:controller]: > rollback system
Using the REST API
POST api/rollback JSON data:{‘system’:true}
POST api/rollback JSON data:{‘system’:true,‘rollback_type’:2}