We had typo in gateway management hostname and after resolving, unable to update hostname in API cloud admin console or command line. Is there a way to update gateway CR with kubectl command? Couldn't delete and recreate either. 

No the endpoints cannot be updated post-deployment.

deleting the existing gateway service from the cloud manager and then recreating it is probably the fastest way to fix it.

What error do you get when you try to delete it?

Hi Chris, we are getting communication error (500?), which is understandable as APIC trying to connect to the management end point to delete from API manager. Anyway now we are able to delete it by putting it back original hostname in F5 and forwarding traffic to 3000. We were able to register again with corrected management endpoint. 

Thanks