What happened?
After upgrading the Zigbee2MQTT addon in Home Assistant from version 2.6.3-1 to 2.7.0-1, Zigbee2MQTT no longer starts.
The system repeatedly attempts to initialize the EZSP adapter but fails with a HOST_FATAL_ERROR.
Reverting back to version 2.6.3-1 and hard resetting the Sonoff Dongle Max restores normal operation.
Environment
Home Assistant OS / Supervisor: 16.3 / 2025.11.5
Zigbee2MQTT addon version:
Working: 2.6.3-1
Failing: 2.7.0-1
Coordinator: Sonoff Dongle Max (EFR32MG21, EZSP) connected via USB port
Zigbee-herdsman version in logs: 6.3.2
Hardware: raspberry pi 5
What did you expect to happen?
Zigbee2MQTT should start normally after upgrading the addon.
How to reproduce it (minimal and precise)
- Update Zigbee2MQTT addon from 2.6.3-1 to 2.7.0-1.
- Start the addon.
- Observe that Zigbee2MQTT fails to start with EZSP errors.
- Revert to 2.6.3-1 and hard reset the Sonoff Dongle Max → the system starts correctly.
Zigbee2MQTT version
2.7.0-1
Adapter firmware version
can't access the frontend
Adapter
Sonoff Dongle Max
Setup
Add-on on Home Assistant OS running on raspberry Pi 5
Device database.db entry
No response
Debug log
info: z2m: Starting Zigbee2MQTT version 2.7.0-1
info: zh:ember:uart:ash: ======== ASH Adapter reset ========
info: zh:ember:uart:ash: ======== ASH starting ========
(repeated multiple times)
error: z2m: Failed to start zigbee-herdsman
error: z2m: Error: Failed to start EZSP layer with status=HOST_FATAL_ERROR.
at EmberAdapter.initEzsp (...)
at EmberAdapter.start (...)
Notes
- No configuration changes were made before or after the upgrade.
- Issue seems specific to the EZSP adapter (Sonoff Dongle Max).
What happened?
After upgrading the Zigbee2MQTT addon in Home Assistant from version 2.6.3-1 to 2.7.0-1, Zigbee2MQTT no longer starts.
The system repeatedly attempts to initialize the EZSP adapter but fails with a HOST_FATAL_ERROR.
Reverting back to version 2.6.3-1 and hard resetting the Sonoff Dongle Max restores normal operation.
Environment
Home Assistant OS / Supervisor: 16.3 / 2025.11.5
Zigbee2MQTT addon version:
Working: 2.6.3-1
Failing: 2.7.0-1
Coordinator: Sonoff Dongle Max (EFR32MG21, EZSP) connected via USB port
Zigbee-herdsman version in logs: 6.3.2
Hardware: raspberry pi 5
What did you expect to happen?
Zigbee2MQTT should start normally after upgrading the addon.
How to reproduce it (minimal and precise)
Zigbee2MQTT version
2.7.0-1
Adapter firmware version
can't access the frontend
Adapter
Sonoff Dongle Max
Setup
Add-on on Home Assistant OS running on raspberry Pi 5
Device
database.dbentryNo response
Debug log
info: z2m: Starting Zigbee2MQTT version 2.7.0-1
info: zh:ember:uart:ash: ======== ASH Adapter reset ========
info: zh:ember:uart:ash: ======== ASH starting ========
(repeated multiple times)
error: z2m: Failed to start zigbee-herdsman
error: z2m: Error: Failed to start EZSP layer with status=HOST_FATAL_ERROR.
at EmberAdapter.initEzsp (...)
at EmberAdapter.start (...)
Notes