Extensive performance improvements including expanded RDM support; six-channel dimmers add CCT and magenta/green point DMX profiles (Arri/KinoFlo-style personalities). LumenRadio Timo RX RF module has a separate firmware stream via LumenRadio's own site.
steps
what you'll need: RC4 CodeLoader 3.x software + RC4 CodeLoader cable. RC4 Commander NOT required (LumenDim is not compatible with RC4 Commander, use RDM for configuration). Before flashing, turn off or un-pair the transmitter so the RF card disconnects.
1Download RC4 CodeLoader 3.3.3 for Mac or PC from https://rc4wireless.com/download/
2Download firmware zip 'Firmware_for_all_LumenDim_Devices_Aug2025' from https://rc4wireless.com/download/
3Connect the RC4 CodeLoader cable to a USB port on your computer
4Turn off (or un-pair) any transmitter the LumenDim is paired to, the RF card must be functionally disconnected before CodeLoading
5To un-pair manually: press and hold the RF button on the device for several seconds until the blue RF LED goes off
6Connect the 3.5mm end of the CodeLoader cable to the small receptacle on the RC4 device
7Open RC4 CodeLoader, select the correct COM port for the cable, and select the device type to update
8Hold the Func button while applying power to the device, the green COP LED should illuminate without blinking (CodeLoader mode). You have 5 seconds to begin
9In CodeLoader, press 'Transmit Data'. Watch the progress bar crawl left to right. Device restarts when complete.
10After successful flash, restore factory defaults: with device powered on, hold Func button and tap the Set A button (NOT the RF button). Three LEDs blink simultaneously to confirm.
11Reconfigure the dimmer for your application (factory reset clears all settings)
12Optional: update LumenRadio Timo RX RF module separately via LumenRadio's site at https://lumenradio.com/support/?post_id=1956&category=crmx-oem-modules&protocol=wireless-dmx
WarningRC4 Commander is NOT compatible with LumenDim, do not attempt to use it for configuration; use RDM instead
WarningRF card must be disconnected (transmitter off or device un-paired) before CodeLoading or the update may fail
GotchaAfter loading v118 or later firmware, device may enter a test mode (yellow DMXLED solid, no other indicators). Cycle power off/on to exit, this is a one-time event
GotchaFactory defaults MUST be restored after every firmware update, failure can cause unexpected behavior and error messages
GotchaLumenDim contains a separate LumenRadio Timo RX RF module that has its own firmware managed by LumenRadio, not RC4. Update that separately if needed.
WarningLoading wrong firmware file will not brick the device but causes rapid/continuous LED flashing, repeat with correct file
GotchaCodeLoader bundled with CodeLoader 3.3.3 is firmware 4.129.0.1 which may NOT be the latest, always download the separate Aug2025 firmware zip from the downloads page