Updating Fireflies PL47G2/PL47MU, Sofirn LT1, and other 3 over 3 Lights¶
The Fireflies PL47G2/PL47MU, some revisions of the Sofirn LT1, and potentially other lights from Fireflies and Sofirn use a similar setup of 6 flashing pads in a 3 over 3 layout. If the light has no pads, or a different number of pads, this guide will not work.
An LT1 without pads, or with incompatible pads, can likely still be updated using the SOIC8 method covered in Updating a 2020 Sofirn SP36 Pro, Sofirn LT1, and other SOIC8 Lights.
Identify The Light And Current Firmware¶
Because of the variations in firmware, the best method of Identifying the Correct Firmware is to do a Version Check. That said, the lights may have shipped with versions too old to print model information. For the most part these lights use the firmware listed in the Anduril MODELS file with a notable exception for lights that use Nichia 219 emitters, which will be mentioned later.
Programmer Hardware and Probe¶
Updating these lights requires a USBASP programmer and a probe capable of using a 3 over 3 layout.
Setup the USBASP programmer as described in USBASP Drivers.
There are no official or pre-made kits for updating these lights, but there are several ways to adapt or craft compatible probes:
When connecting the probe to the light, use the notes in the guide for the probe for specifics on how and where to connect the probe.
Obtain a New Firmware File¶
Download or compile the appropriate firmware as described in Obtaining a new Firmware File.
If the PL47G2 uses emitters other than Nichia 219, use
If the PL47G2 uses Nichia 219 emitters, use either the
pl47-219variant or compile a variation of the pl47g2 firmware with the lower FET PWM levels safe for use with the Nichia emitters.
pl47-219firmware disables low aux levels so it’s not ideal for use on the PL47G2.
See this commit on my fork of Anduril 2 for an example of the necessary changes to make a custom
pl47g2-219variant. I have also posted a pre-compiled version of the hex file for this variant.
Setup Programming Software¶
Choose one of the Flashing Methods, setup the software, and use the software-specific guide for the following steps.
For simplicity, this guide will use avrdude examples, but zflasher can also be used in a similar manner.
Test the Connection with the Light¶
Unscrew the head from the light and locate the flashing pads.
Connect the probe to the programmer, the programmer to the computer or android device, and connect the probe to the flashing pads on the light.
Refer to the probe-specific documentation for specifics about how the probe will connect to the pads on the light.
Use the test or ping function of the flashing software to confirm the connection is working.
PS> .\avrdude.exe -p t85 -c usbasp -n
Backup the Current Firmware¶
Connect to the light and read the current firmware from the light to a file to make a backup.
PS> .\avrdude.exe -p t85 -c usbasp -U flash:r:old-firmware.hex:i
Update the Light with New Firmware¶
Connect to the light and write new firmware from the file to the light.
PS> .\avrdude.exe -p t85 -c usbasp -U flash:w:anduril.ff-pl47g2-219.hex
Perform a Factory Reset¶
Perform a Factory Reset after reassembling the light.