Downlink command not working

Hi all, I am trying to setup and configure the LW006 SB device. I am using the LW006 Downlink Command Document from here.

On sending certain commands such as read heartbeat interval with hex: “ED002000” to Fport 10, I get a response back from the device in the format as mentioned in the document.

However, while trying to set / read any device mode parameters, there is no uplink response from the device. Example - Read device mode selection “ED00190100” does not get any response from the device but just a txack message

I’ve tried this out on 3 different LW006 devices and it seems to have the same behavior. Any idea what might be going on?

ChirpStack: Version: v4.10.2