In the first releases, IA Agent was not supported by SMB at all - with R77.20.31, using the Agent started being supported by central managed SMBs. MUH Agent and Identity Collector are not supported at all on SMB.
When i change from local to central management, only settings available in WebGUI when using central management are retained, others - like VPN, TP or Access Policy settings will vanish, device network configuration and some other settings will be kept.
CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist