Upgrading to VIOS 4.1 means install the latest service pack on VIOS 3.1 first!

Let's install it using Ansible!

Yes, you can! You can upgrade almost any VIOS version from 3.1 to 4.1, and it will most likely work. BUT! IBM employees are humans, not robots. They can’t test every possible combination of hardware and software in the world to be sure that your upgrade path will work without any problems. That’s why there are “supported” VIOS levels you can upgrade to …