Upgrading AFSK to PSK modulation still focuses on programming on the motherboard, with no hardware alterations required, akin to how a single computer can run either Windows or Linux systems. When constructing the AFSK data transmission link, Ban Xia had already established a complete set of motherboard, radio, monitor, and input and output systems. This pile of electronic scrap, seemingly cobbled together, is actually powerful. The Celeron 3150 industrial motherboard, a pinnacle of technology before the destruction of human civilization, possesses sufficient capability to fulfill the tasks assigned by Ban Xia. After the apocalypse, such items could no longer be created; one could only scavenge for them amidst the ruins. Simply put, this could be called an Ancient Divine Artifact.