ZHA: EZSP version 18 protocol not supported

[ralfbergs]

The problem

SMLight recently published a firmware update for their SLZB-06M Zigbee gateway, Revision: 20251204.

When flashed with this coordinator firmware, ZHA is unable to see any Zigbee device.

According to SMLight support, this is because ZHA supposedly doesn't yet support EZSP version 18 protocol.

What version of Home Assistant Core has the issue?

core-2025.12.5

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

ZHA

Link to integration documentation on our website

https://www.home-assistant.io/integrations/zha/

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response

[home-assistant]

Hey there @dmulcahey, @Adminiuga, @puddly, @TheJulianJES, mind taking a look at this issue as it has been labeled with an integration (zha) you are listed as a code owner for? Thanks!

Code owner commands

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• @home-assistant close Closes the issue.
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• @home-assistant reopen Reopen the issue.
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• @home-assistant add-label needs-more-information Add a label (needs-more-information, problem in dependency, problem in custom component) to the issue.
• @home-assistant remove-label needs-more-information Remove a label (needs-more-information, problem in dependency, problem in custom component) on the issue.

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Please make sure your report includes the following things:

1. Please enable ZHA debug logging, let it run for 10-15 minutes, and make sure to capture whatever problem you're having in the debug log. 2. Download diagnostics JSON for the ZHA Integration for the specific devices you're having problems with. 3. Any issues whatsoever with Tuya devices or device support requests in general need to be made in the ZHA quirks repo https://github.com/zigpy/zha-device-handlers/issues, not Core's issue tracker. 5. Fill out the issue template and include whether or not you're using a VM/Proxmox with USB passthrough, what addons you have installed, and so on.
   ZHA does not have low-level control over your network, the mesh is self-organizing. If you started having network issues in a specific release, the release probably didn't cause the issue. Check your environment for new sources of 2.4GHz interference and make sure you're using an extension cable, not placing the coordinator near SSDs and USB 3.0 ports, etc. Just because things worked in the past with a bad setup doesn't mean they'll keep working in the future.
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zha documentation
zha source
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