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FM-1-transporter, image 1 from its README
Firmware

FM-1-transporter

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FM-1-transporter is custom firmware for the M-VAVE FM-1, by @kurogedelic. Open source under MIT, latest release v0.1.0 (November 2026), 66 stars on GitHub.

forM-VAVE FM-1·by@kurogedelic

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fm1_transporter_xiao_rp2040.uf2· 161 KB· +3 files

MIT· kurogedelic/FM-1-transporter·downloads come from the creator’s GitHub releases

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FM-1 Transporter

日本語

▶ Open the web app (Chrome / Edge)

Connection

Read and write the flash of the M-VAVE FM-1 (JieLi AC791N / WL82) from a computer, through a small RP2040/RP2350 board wired to the FM-1's USB lines.

Hardware

Three wires only. Do not connect VBUS; the FM-1 runs on its battery.

BoardD+D-Status
Seeed XIAO RP2040D6 (GP0)D7 (GP1)✅ Recommended
Raspberry Pi Debug Probe (UART connector)TX (GP4)RX (GP6)✅ Tested
Raspberry Pi PicoGP0GP1⚠️ Builds, untested
Raspberry Pi Pico 2GP0GP1⚠️ Builds, untested. May need external 15 kΩ pull-downs on D+/D- (RP2350 E9)
Waveshare RP2350-USB-A / USB-C / USB-CMGP12GP13⚠️ Experimental, not recommended. Needs board mods (remove the 1.5 kΩ D+ pull-up, keep VBUS off the FM-1) and a firmware port

All boards: GND to GND.

Install

  1. Download the UF2 for your board from Releases.
  2. Hold BOOTSEL, plug the board in, and copy the UF2 to the RPI-RP2 drive.
  3. Get wl82loader.bin from jl-uboot-tool. It is not included here; it is sent to the board's RAM when you use the tool.

Use

Web app (Chrome or Edge): open https://kurogedelic.github.io/FM-1-transporter/web/ and follow the steps.

CLI (needs pyserial):

python3 tools/fm1t.py --loader wl82loader.bin info
python3 tools/fm1t.py --loader wl82loader.bin dump backup.bin
python3 tools/fm1t.py --loader wl82loader.bin write --package FM-1_vNN.fwsc --ref backup.bin --write

Without --write, write only checks. If the FM-1 has no working firmware, run fm1t.py rekey, then power the FM-1 on. See fm1t.py --help for the rest.

Build

pico-sdk 2.2.0, ARM GCC and CMake.

git submodule update --init
cmake -S . -B build -DPICO_SDK_PATH=$HOME/pico-sdk -DPICO_BOARD=seeed_xiao_rp2040
make -C build -j8 fm1_transporter

Pico: -DPICO_BOARD=pico. Pico 2: -DPICO_BOARD=pico2. Debug Probe: -DFM1T_BOARD=debugprobe -DPICO_BOARD=pico.

Cautions

  • Use at your own risk. Always keep a dump before writing.
  • Only 0x4000–0x93000 is ever written.
  • After a session, power-cycle the FM-1 before using it over USB.
  • Not affiliated with M-VAVE or JieLi.

Architecture · Protocol · Dev log · AGENTS.md

License

MIT. Includes Pico-PIO-USB (MIT). Some routines are ported from jl-uboot-tool (MIT).