Custom payload file for updating devices of an information handling system

An information handling system includes a memory and a baseboard management controller. The memory stores one or more device update packages, and each of the first device update packages includes an inter-integrated circuit payload. The baseboard management controller receives a first device update package, and stores the first device update package in the memory. In response to the first device update package being stored in the memory, the baseboard management controller launches a handler. The baseboard management controller retrieves a bus number and an address for a target device identified in the first device update package. The baseboard management controller parses data in a body of the inter-integrated circuit payload of the first device update package, and executes inter-integrated circuit commands in the body to provide a firmware image update to the target device.