When I install GST-80x into MC-1600MR / MC-1610MR Managed Chassis series, why the Managed Chassis cannot detect the GST-80x?

This situation appears cause older firmware version in MC-1600MR / MC-1610MR Managed Chassis does not support GST-80x, please go to Planet Website and download following firmware version for GST-80x support on MC-1600MR / MC-1610MR Managed Chassis.
• MC-1600MR series: FW-v1.2b090716 or after.
• MC-1610MR series: FW-V1.1b090420 or after.