OTA firmware update stalls for Legrand device

logs-19.txt

Summary:
OTA update for Legrand Zigbee device (e.g., Double gangs remote switch) initiates and transfers image blocks successfully, but stalls before completion.

Details:

• Device: Double gangs remote switch (IEEE 0x0004740000b92752)
• ManufacturerCode: 4129, imageType: 22
• Update starts, blocks transfer as expected, controller responds with status=0
• Progress remains at 0%, never completes
• Near end of transfer, device sends cluster 'manuSpecificLegrandDevices' command '9', which fails:
  Failed to parse frame: Error: Cluster 'manuSpecificLegrandDevices' has no command '9'
• Zigbee2MQTT logs: No converter available for this cluster/command
• No "upgrade end request" or error message received from device

Possible causes:

• Missing manufacturer-specific command support in Zigbee2MQTT/OTA handler
• Firmware expects unsupported protocol after block transfer
• Firmware image or device resource issue

Suggested actions:

• Investigate support for Legrand manufacturer-specific clusters/commands post-OTA
• Add or update converter for 'manuSpecificLegrandDevices' (command '9')
• Confirm full OTA update sequence and post-transfer handling for Legrand devices

Relevant log excerpt:

[2025-09-30 15:12:12] zh:controller: Failed to parse frame: Error: Cluster 'manuSpecificLegrandDevices' has no command '9'
[2025-09-30 15:12:12] z2m: No converter available for '067774' with cluster 'manuSpecificLegrandDevices' and type 'raw' and data '{"data":[21,33,16,32,9,82,39,185,0,0,116,4,0,1],"type":"Buffer"}'

Log file available for full details.

Start with the attached logs and trace the OTA sequence for the Legrand device through the post-transfer handling. Investigate how the manuSpecificLegrandDevices command 9 is parsed and how completion is detected. Done means the full update sequence completes without stalling and the behavior is covered by an appropriate verification case.