#SMLIGHT SLZB-06 fails to update OTA

1 messages · Page 1 of 1 (latest)

keen sail
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Essentially the title of the post.
This happens both for SLZBOS and Zigbee firmwares. The device reports the current Zigbee version as -1, and pressing Update does absolutely nothing on Home Assistant.
On the device logs I can see messages such as

[03.01.1970 02:28:51] zb ota task | OTA task failed!```

If I try to flash it OTA, it queries and finds the updates on the server, but when I press to flash it, it errors with `REQ error: http_code -1` and the same message as above in the logs.

I appreciate this doesn't look like it's related to Home Assistant per se but support has so far been pretty useless so any help would be appreciated!
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hot fossil
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try to download the right firmware to pc, hook up SLZB with usb and flash firmware on pc.

hoary dragon
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Or flash manually via its GUI.

keen sail
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Both of those options work, I'm really looking to get OTA working.

hot fossil
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i think after cable flash method is succesfull, from there OTA will be possible again.

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dont pin me on that though..

keen sail
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I have flashed firmware updates plenty of times manually, unfortunately OTA remains in this state...

hot fossil
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Given the time date stamp of 1970, i suggest checking network / dns / ntp if all set correctly. Also i would delete the slzb, reboot ha and add again.

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give your controller a static lease in router and set controller to auto dhcp.

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If using the controller for zigbee only, you might disable ipv6

keen sail
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Oh I hadn't noticed the date. Let me check what's up with that!

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Unfortunately fixing NTP didn't help...

[17.11.2025 20:59:37] zb ota task | OTA task failed!```
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Few things make me sadder than suggestions to disable IPv6 in 2025, but I tried it anyway because every attempt helps in a process of elimination. Didn't help either.

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Static lease has been in place since forever.

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I'll try the nuclear option of deleting and re-adding. Hope it doesn't mean I have to re-pair everything. 🤞

keen sail
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Nope. Same diff...

hot fossil
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there has been a new firmware release for the 06, might try usb once again

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it also can be possible that you cant do ota because of the firmware currently installed (2024) maybe you can do a incremental update, so update newer firmwares after another.

hot fossil
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for zigbee you dont need ipv6, it only adds an extra layer of problems..

keen sail
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It's 2025. IPv4 has run it's course. I wish we could all just move on. IPv4 is the bane of my existence.

hot fossil
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Cloudflare is down, dont know if that impacts firmware downloads. Bit of reading shows that downloads will be impacted 🙁

keen sail
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It won't make it any worse! 😆

hot fossil
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thats true