MP21ZD / MP31ZD (800 Series) — Firmware

Firmware & Drivers
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Firmware for the MP21ZD and MP31ZD plug-in dimmers (800 Series, 908.42 MHz). This page lists the current release and how to flash it over the air (OTA) from your hub.

1. Current release

Item Value
Current build V8.01 (build V08R10P00H01), file dated 2025-11-03
Applies to MP21ZD (ZW39SU), MP31ZD (ZW39M) — 800 Series
Does NOT apply to MP21ZD 700 Series units

2. Should you update?

Check your current firmware version first (Hubitat: device page; Home Assistant: Z-Wave JS device page). If your devices are working fine you don’t have to rush, but we recommend staying current: newer builds fix reported issues and improve network stability.

3. How to update (OTA)

Hubitat Elevation

  1. Open the device page and click Firmware (Device Firmware Updater).
  2. Select the downloaded .gbl file and start the update.
  3. Do not unplug the device during the transfer (typically 2 to 5 minutes).

Home Assistant (Z-Wave JS / Z-Wave JS UI)

  1. Open the device page and expand Firmware update (OTA).
  2. Upload the .gbl file and confirm.
  3. Leave the device powered for the whole transfer.

Other controllers

Any Z-Wave controller with OTA support (Z-Wave JS UI standalone, Zooz Z-Station / Silicon Labs PC Controller) can flash the same .gbl file.

SmartThings does not support third-party Z-Wave OTA updates. If your device shows issues this build addresses, contact ask@minoston.com.

4. If something goes wrong

  • Update stalls: leave the device powered; large transfers can take a few minutes.
  • Version unchanged after update: run the update once more.
  • Device unresponsive: unplug for 10 seconds, plug back in, and re-run the update. If it still won’t respond, exclude and re-include it.
  • Still stuck: email ask@minoston.com with your hub type and the firmware version shown before the update.

5. Download

The November 2025 build addresses an error reported on earlier builds. Use this one unless support directs you otherwise.

MP21ZD_MP31ZD_V8.01_202511.gbl (current, 148,848 bytes)

  • SHA-256: dc5ee36c2dd12011787654520f22ce071e5d4ae91fb8444a9d6cb136fea503d1

MP21ZD.gbl (earlier bundle, 165,777 bytes)

  • Build version not labeled in the file name. This is a legacy bundle kept for reference only. Do not flash it unless support asks you to; the November 2025 build above replaces it.
    Official source: minoston.com/pages/firmware-driver

Questions? Reply below or email ask@minoston.com.

Firmware Index — All Minoston Devices