Two out of 10 of my Blue Smart Dimmers are failing when trying to upgrade in similar but different ways. I’m running ZHA and the common log errors after the 100% of the firmware is downloaded: 2026-02-05 23:28:57.590 DEBUG (MainThread) [zigpy.zcl] [0x93EF:1:0xfc57] Decoded ZCL frame header: ZCLHead…

Same issue here. 2 of the 3 that I’ve tried have the error.

Oof! I’m not alone but no good because from the errors, I’m not seeing a way to resolve it. The Unknown command seems to be the killer Maybe its related to the hardware of our problem dimmers? Hopefully Inovelli can help us out. Maybe we can save other the pain. Turn on ZHA debug logging before rese…

See: [image] VZM31-SN - Firmware (3.0+) Update Advisory – (Non-Neutral Installations) For those with updating issues, please see this article: Blue Series Switch - Troubleshooting OTA (Over-the-Air) Updates | Inovelli Help Center Also, it might take me a few days to respond as we are working o…

Definitely 4. Rare Issue With Early VZM31-SN Production Batches issue for mine two. It states contact Support but no link or email address. Any clue on how to contact support? Thanks

Same problem. None of my VZM31-SN’s will update. They just reboot back to the same version. I deployed one out of a box that had 2.08, and it kept staying on 2.08. I manually upgraded to 2.18 and it worked fine, but now it’s stuck on 2.18. Any ideas?

Not rare. Not a single one of mine will update to 3.XX release.

It’s related to the locked bootloader.

Chiming in: nearly all of mine are failing to update. The couple switches I bought later worked okay after a couple tries, but the ones I pre-ordered at initial release fail, sometimes throwing an “ABORT” error after ~70% (I’m not watching every exact %). Most are on 2.18, a couple were stuck on 2.1…

I also saw the ABORT message pop up on several of my switches. Turned out it was combo of the firmware and the Zigbee2MQTT OTA settings that I had. I updated the firmware on my Zigbee radio and it solved the ABORT issue but I also have the issue with the early production releases.

VZM31-SN Firmware upgrade failures going from 2.18 to 3.04

Product Support Hardware & Firmware Help

rohan February 7, 2026, 5:00am 4

See:

Blue Series 2-1 Firmware Changelog | VZM31-SN