I have a number of C240 M3 servers in my lab. Since flash was depricated some time ago, management of these was still possible via the CLI, but it certainly wasn't as easy.
There is now a flash based browser that has been published that can be used to restore full functionality to the CIMC via its GUI. The browser isn't as capable as say Chrome, but it does restore full access to your old servers that you're using in things like lab environments.
You can download a copy of the flash based browser here: https://flash.pm/browser
