E7a Mb Pcb V3 Link -
With the link active, you can use GDB:
This is the primary ribbon cable "link" that connects the motherboard to the sub-board (charging port and speaker area). e7a mb pcb v3 link
While the Hashboards have their own PSU connections, the Link PCB often carries low-voltage logic power or passes through control signals. With the link active, you can use GDB: