I would once again request you to provide the factory images that came with our DSGW-040 gateways.
The lastest image you shared which employs Openzwave will not work for us, Openzwave does not support inclusion of certain secure devices and since openzwave support has been deprecated we are unable to find a workaround.
Hence we require the factory image for the DSG-040 which had OpenWRT v14.07 and Z/IP gateway instead of Openzwave.