Complex sentence: Contrary, software or respectively firmware interfaces (software engineering, electrical engineering) are not significiant for assembly operations, because these can be "easily" flashed within one production step, what itself is a cost efficient way to enable a wide range of product variants.
Split into simpler sentences: Contrary, software or respectively firmware interfaces (software engineering, electrical engineering) are not significiant for assembly operations, because these can be "easily" flashed within one production step. That itself is a cost efficient way to enable a wide range of product variants.