Examples relate to providing operating system (OS) agnostic validation of firmware images. In some examples, a request to verify a number of firmware images is received, where each of the firmware images is associated with a metadata set. A first installation of a first firmware image of the firmware images is accessed via a physical interface, and a first metadata set is used to verify the first installation, where the first metadata set includes a firmware signature that is used to verify the first installation. At this stage, the request is forwarded to a child management processor, where the management processors are in a trusted group and related according to a tree hierarchy.