Pushing changes to devices
Once the firmware image is uploaded, you can go to Devices and scroll down to the DEVICES area and click on Update Firmware.
You will have the opportunity to choose a desired firmware image and schedule an update for a later time if needed.
You will soon realize that under the Devices tab, Organization is the top-most device grouping level, where all connected devices will be shown. Any other sub level (Subnet Group, Subnet, Name Scope, Asset Tag-based group, Manual Group) can be selected as well. With this in context, especially for large organizations, this will help filter devices narrowing group selections, therefore, making it easier to perform update tasks on selected devices only (e.g. selected devices from one particular branch or department within your whole organization).
Firmware update may require licensing
PMC access and firmware update
may require licensing. When not properly licensed, you may get a warning when updating. Be sure to purchase the proper licenses for your devices if needed.