TalkTalk Wi-Fi Hub (F@ST 5364) firmware SG4K100208: Device/DeviceInfo container blocked, leaf fallback works; Device/Hosts/Hosts works; DSL rates + throughput paths confirmed; request-level errors can mask per-action success

[axxa42]

Model information

Key	Value
Model name	F@ST 5364 (TalkTalk Wi-Fi Hub)
Hardware Version	F@ST 5364
Software Version	External: SG4K100208 / Internal: 15.24.42_Prod

Describe the bug

On the TalkTalk-branded F@ST 5364, reading the Device/DeviceInfo container node fails with XMO_UNKNOWN_PATH_ERR, causing get_device_info() in python-sagemcom-api to raise an UnknownPathException.

However, individual leaf values under Device/DeviceInfo/* are readable and return valid data. This suggests the container is intentionally blocked while leaf access remains supported.

To Reproduce

1. Authenticate successfully via /cgi/json-req using a logIn action.
2. Attempt to read the container node:

   Device/DeviceInfo
   

3. Observe error:

   XMO_UNKNOWN_PATH_ERR
   

4. Read individual leaf paths instead:

   Device/DeviceInfo/ProductClass
   Device/DeviceInfo/InternalFirmwareVersion
   Device/DeviceInfo/ExternalFirmwareVersion
   Device/DeviceInfo/UpTime
   

5. Observe valid values returned for all leaf paths.

Expected behavior

get_device_info() should succeed on this model.

A possible approach is to fall back to querying known Device/DeviceInfo leaf values when the container node returns XMO_UNKNOWN_PATH_ERR, and construct a minimal device info object from those values.

Screenshots

N/A – reproduced via API/XHR calls and browser console ($.xmo.*), not GUI interactions.

Additional context

Other confirmed working paths on this model:

• Hosts:

  Device/Hosts/Hosts
  

  Returns a full list of host objects (MAC, IP, active state, interface type, etc.).

• DSL negotiated rates:

  Device/DSL/Channels/Channel[@uid='1']/DownstreamCurrRate
  Device/DSL/Channels/Channel[@uid='1']/UpstreamCurrRate
  

• Throughput counters without running a speed test:

  • LAN:

    Device/Ethernet/Interfaces/Interface[Alias="PHYx"]/Stats/*
    

  • WAN:

    Device/IP/Interfaces/Interface[Alias="IP_DATA"]/Stats/*
    

Notable quirks observed:

• Multi-action /cgi/json-req requests may return a request-level error even when individual actions succeed; action-level results should be evaluated independently.
• Some container nodes are blocked while their leaf children remain accessible (as seen with Device/DeviceInfo).
• SFP-related paths appear unsupported on this firmware and return errors.

All MAC addresses, IP addresses, auth tokens, nonces, and session identifiers have been redacted or replaced.