A first firmware source code portion corresponding to an immutable firmware portion of specific firmware to be deployed with embedded devices is identified. A second different firmware source code portion corresponding to a mutable firmware portion of the specific firmware to be deployed with the embedded devices is identified. The first firmware source code portion is used to generate the immutable firmware portion of the specific firmware. The second firmware source code portion is used to generate the mutable firmware portion of the specific firmware. The immutable firmware portion of the specific firmware is caused to be installed in fixed storage drives of an embedded device in the embedded devices. The mutable firmware portion of the specific firmware is caused to be installed in swappable storage drives of the same embedded device.