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Sofirn SC31 Pro UPDI Flash Adapter

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foorschtbar

@foorschtbar

Flash Adapter for Pogo Pins to update the firmware of a Sofirn SC31 Pro

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Updated at source: Jul 22, 2025

Model information

Source: Printables
Category: Electronics
License: Creative Commons — Attribution

Details Files (2)Makes & comments (Makes: 0) (Comments: 0)Remixes (0)Collections (2)

If you want to update the firmware of your Sofirn SC31 Pro and you had a newer revision with exposed UPDI pads, you can use this adapter with pogo pins to easily flash a new firmware to your Sofirn SC31 Pro.

Print instructions

Printed Parts

1x Print Flash Adapter

Notes on printing

Layer height: 0.1mm
Filament: PLA

Additional Parts

Build instructions

Print Flash Adapter
Wire the Adapter (see pictures)
- Left (R on the PCB, orange in the picture) to UPDI D
- Center (no marking on the PCB, back on the picture) to UPDI GND/-
- Right (+ on the PCB, red on the picture) to UPDI VCC/+

Flash instructions

First: No warranty is for this guide. Use at your own risk.
Check to connection to the MCU of you flashlight. Replace <serial-port> with the UPDI serial port on your platform like COMx or /dev/ttyUSBx. Depending on your UPDI programmer, maybe you need to change jtag2updi to updiserial.

❯ .\avrdude -p attiny1616 -c jtag2updi -P <serial-port> /-n
avrdude: AVR device initialized and ready to accept instructions
avrdude: device signature = 0x1e9421 (probably t1616)avrdude done.  Thank you.

If this not work, check the connection or you UPDI programmer

❯ .\avrdude -p attiny1616 -c jtag2updi -P <serial-port> -n
avrdude error: UPDI link initialization failed
avrdude error: initialization failed, rc=-1
        - double check the connections and try again
        - use -b to set lower baud rate, e.g. -b 57600
        - use -F to override this check

Backup the old Firmware

❯ .\avrdude -p attiny1616 -c jtag2updi -P <serial-port>  -Uflash:r:old-firmware.hex
avrdude: AVR device initialized and ready to accept instructions
avrdude: device signature = 0x1e9421 (probably t1616)
avrdude: processing -U flash:r:old-firmware.hex:r
avrdude: reading flash memory ...
Reading | ################################################## | 100% 3.37 s
avrdude: writing output file old-firmware.hex
avrdude done.  Thank you.

Flash new Firmware. For the Sofrin SC31 Pro you need the sofirn-sp36-t1616 firmware (identical hardware platform) from the offical repo of ToyKeeper/anduril

❯ .\avrdude -p attiny1616 -c jtag2updi -P com3 -Uflash:w:anduril.r2025-07-07.sofirn-sp36-t1616.hex
avrdude: AVR device initialized and ready to accept instructions
avrdude: device signature = 0x1e9421 (probably t1616)
avrdude: Note: flash memory has been specified, an erase cycle will be performed.
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: processing -U flash:w:anduril.r2025-07-07.sofirn-sp36-t1616.hex:i
avrdude: reading input file anduril.r2025-07-07.sofirn-sp36-t1616.hex for flash
         with 10452 bytes in 1 section within [0, 0x28d3]
         using 164 pages and 44 pad bytes
avrdude: writing 10452 bytes flash ...
Writing | ################################################## | 100% 2.59 s
avrdude: 10452 bytes of flash written
avrdude: verifying flash memory against anduril.r2025-07-07.sofirn-sp36-t1616.hex
Reading | ################################################## | 100% 2.18 s
avrdude: 10452 bytes of flash verified
avrdude done.  Thank you.

After flashing do a factory reset.

Links
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