Firmware Change-log: LZW31-SN - Dimmer Switch (Red Series)

Firmware Change-log: LZW31-SN - Dimmer Switch (Red Series)

Latest Production Version = 1.57.otz and 1.45.bin
Latest Beta Version = 1.61.otz and 1.45.bin


Please see below for the change-log for the firmware of the Red Series Dimmer Switch (LZW31-SN). This page will be continuously updated with the most up-to-date firmware file locations, bug fixes and enhancements.

Firmware Versions & Links

Please see below for the various versions of the firmware. Please keep in mind there are two parts to this firmware: .otz (Target 0) - Z-Wave MCU and .bin (Target 1) - Holtek MCU.

Click on the below to download the firmware files -- if you have Hubitat, you can right click (Copy link Address) on the hyperlinks to copy the URL for the Firmware Updater



V1.61 - 10/19/2021

Fixed - Dimmer sending duplicate reports in certain scenarios while being controlled by certain hubs. 

V1.57 - 06/29/2021

Fixed - Optimization of Aux mode in neutral setting.
Fixed - The inoperative issue after changing parameter 8 from high value to low value.

V1.56 - 05/10/2021

Fixed - Further optimization of Aux switch support in neutral and non-neutral. 

V1.55 - 04/28/2021

Fixed - When parameter 52 is set to 1 the physical button press would not turn the load off

V1.54 - 04/26/2021

Modify parameter 52 to provide 3 modes. 0 - Normal, 1 - On / Off only mode, 2 - Smart Bulb Mode
Fixed - Aux Can Turn Off but Not On when in Non Neutral mode
Fixed - Protection Set v1 Enabling Protection v2 Remote
Fixed - Boot Loop Issue in Non-Neutral (Red, Green, Blue LED)
Fixed - Aux Switch Not Causing Scenes to be Sent

V1.53 - 03/10/2021

1.53 has been removed temporarily as it is missing some features that were not supposed to be removed. Version 1.54 will be released in its place.

V1.52 - 01/22/2021

Modified Smart Bulb Mode so that the output can only be turned off by sending a BasicSet(0x00).
Fixed: Solve the problem that the power measured by the light is 5W when the load is not connected (caused by inaccurate power measurement at extremely low power consumption).

V1.51 - 01/08/2021

Fixed: Low brightness would brighten and then darken when being dimmed.
Fixed: Issue where the same value of parameter 5 (Minimum Level) appears inconsistently when both parameters 21 (Power Type =1 - Neutral) and 22 (Switch Type = 1 – 3-Way) are set to 1.

V1.49 - 12/16/2020

Remove local configuration mode (to make space for extra features).
Adding parameter 50 to adjust the delay when parameter 51 is set to 1. 1=100ms, 2=200ms, 3=300ms, etc.
2x taps on the config button will now send a configuration report of a value 0 to indicate the animation has stopped.
Have device send “SwitchMultiLevelSet” every 1 second to associated devices as the device dims up & down for association group 3.
Config Button 2x press will turn off a notification and also send a 2x pressed scene to the hub.

V1.48 - 09/01/2020 

Bug Fixes

Fixed: S2 bootstrapping issue. Improves S2 compatibility with 700 series hubs like Hubitat C-7.

V1.47 - 07/17/2020 

Bug Fixes

Fixed: Bug that when you select the parameter in local config mode and do not edit it. If you long press the config key to save it, it will set to 0.
Fixed: If you are OTA during dimming, that will cause the bulb to flash.
Fixed: when a device is not on a network, a factory reset by holding down the config button for 25 seconds does not reset the configuration. 
Fixed: multiple switches blink green (like they were excluded)when more than one switch is not on a z-ware network and one of those switches is 


Add parameter 51, to enable instant on (ie: disable the 700ms delay). Note, if you disable the delay, it will also disable scene control except for Button 1 (ie: tap up 1x or tap down 1x) and button 7 (config button). All other buttons (2-6) will be disabled.
Parameter 51
Size: 1 Byte
Default: 1
Range: 0-1
0: No Delay
1: 700ms Delay
Added parameter 52. Use to put the switch into "smart bulb" mode. If it set to 1, the power will output maximum % when the dimmer is on. 0 = normal operation, 1 = smart bulb.

V1.45 - 06/22/2020


Removed parameter 7 (Invert Switch) and parameter 10 (Default Level) in local configuration mode. This was to make room on the limited Z-wave 500 chip for the following changes:

Increase the output ratio value on the PWM for better compatibility of Smart Bulbs when in single pole or aux switch mode.
Added the ability to change the LED bar to white when parameter 13 is set to 255.

V1.44 - 05/27/2020

Bug Fixes

Fixed: Bug when double press the switch immediately after using up/down button causes the LED bar to be incorrect.
Fixed: Holtek firmware was saving data too often causing the bulb to flicker. 

V1.43 - 04/11/2020

Bug Fixes

Fixed: Bug where parameter 5 could not be set below 10.
Fixed: Bug that Switch Multilevel Start Level Change cannot change level below minimum level parameter number.
Fixed: Bug that Switch Multilevel Start Level Change command can not set the association device brightness to 1%.
Fixed: Bug where the LED bar would work abnormally when the local switch and aux switch are used together.
Fixed: Bug that meter report is sent during dimming resulting in an inaccurate report.
Fixed: Bug that power meter value is 0 when light brightness is 0.


Modify the default value of parameter 11 to 100.
Change the calculation method of parameter 20. Change it from % to KWH. 0=0.01KWH, 10=0.1KWH, 100=1KWH; Modify the range value of parameter 20 to 0~127.
Restart the "Safe guard" time of meter report when the level has been changed. The "Safe guard" timer is to prevent network flooding when device power fluctuates. 

V1.41 - 03/28/2020

Bug Fixes

Fixed Energy & power reporting not being disabled when configuration options are set to 0.
Fixed Power reports flooding network when bulb power consumption fluctuates frequently. 
Homeseer: Fixed not processing BasicReports when sent after turning switch on/off from the wall. Changed to SwitchMultiLevelReport.
Vera: Fixed association purging issue. Vera was not properly processing group #4 group name. Shortened the name to resolve this issue.
Fixed state sometimes not being restored properly when local protection is enabled.
Fixed dimmer turning off when level rises above 80% on certain circuits. Make sure parameter 21 & 22 are set correctly.
Fixed an issue where when the user sets parameter 5 in switch config mode it causes an exception.
Fixed additional bugs for setting configuration parameters in switch config mode for parameters 5,9,10,11.
Fixed an issue where holding the down key to adjust a device in association group 4 would sometimes turn it off.
Fixed a bug where the duration of parameter 17 is far from the expected value.
Fixed an issue where the interval time of Central Scene notification is far from the expected value.
Fixed the issue of sending two Meter reports when the device is powered on.


Notifications no longer turning off when user adjusts the level or performs various other actions on the switch.
Changing minimum level to 10% to accommodate likely use of LED bulbs.
Change the range of parameter 19 to 0,30-32767 to prevent users from choosing a value that may flood the network. 


Please see the following KB articles for instructions to update your firmware.

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