Log in to the Avi Load Balancer shell prompt and use the following upgrade commands for various options.
Use the upgrade controller image_ref <image name> command to upgrade the Controller to a base image.
[admin:-controller]: >upgrade controller image_ref 18.2.6-9000-20191031.063017
Use the upgrade controller image_ref <image name>controller_patch_ref <patch name> command to upgrade the Controller to a base image and an Avi Load Balancer Controller patch.
[admin:-controller]: >upgrade controller image_ref 18.2.6-9134-20191101.042535 controller_patch_ref 18.2.6-9134-2p1-20190806.011824