Controlling mid server version and mid server upgrades.
The MID Server is configured to check with the ServiceNow instance hourly to determine whether it needs to upgrade. This is what automatic mid server upgrades are about. This configurable behavior allows the MID Server to upgrade automatically when the instance upgrades.
If you would like the midserver to use a particular version that is different from the version of the instance that you are on, you can pin the version so the instance upgrade does not upgrade the mid server version. Here's the mid server configuration parameters you can use-
Using these properties will enable you to manage and control the midserver version. You can set the value of these parameters to the version that you'd like the midserver to use.