I had same issue when copying IOS file by tftpdnld. I fixed it by increasing timeout value as "TFTP_TIMEOUT=72000" rommon 18 > tftpdnld IP_ADDRESS: 10.8.x.xIP_SUBNET_MASK: 255.255.255.0DEFAULT_GATEWAY: 10.x.x.1TFTP_SERVER: 10.x.x.1TFTP_FILE: uc500.T4...