BMCU Flasher

Cross-platform flasher for BMCU (WCH ISP protocol).

• OS: Linux / Windows / macOS / Android
• Modes:
  • USB (BMCU with CH340 on board, AutoDI)
  • TTL (pin header / external USB-Serial, manual BOOT + RESET)
• Android:
  • USB (CH340 + USB OTG)
  • TTL (external USB-Serial, manual BOOT + RESET)
  • Online flash only (no local .bin picker)
  • App language follows system language

Download

Download prebuilt binaries from Releases.

Main builds:

• Windows x64: BMCU-Flasher-windows-x64.zip
• Windows x86: BMCU-Flasher-windows-x86.zip
• macOS Apple Silicon (arm64): BMCU-Flasher-macos-arm64.zip
• macOS Intel (x86_64): BMCU-Flasher-macos-x86_64.zip
• Linux x64: BMCU-Flasher-linux-x64.tar.gz
• Linux arm64: BMCU-Flasher-linux-arm64.tar.gz
• Android APK: BMCU-Flasher-android.apk

Legacy / experimental / community (older OS, best-effort):

• Windows legacy (older Windows): BMCU-Flasher-windows-legacy-x64.zip, BMCU-Flasher-windows-legacy-x86.zip
• macOS Catalina 10.15 (Intel): BMCU-Flasher-catalina-1.2.1.zip (community build by Doyle4, tested on Catalina)
• macOS legacy try (CI attempt): BMCU-Flasher-macos-x86_64-legacy-try.zip (may not run on Catalina)

Android requirements

• Android 5.0+ (API 21+) (minSdk=21)
• USB OTG + USB host mode
• CH340 supported for USB mode
• External USB-Serial adapters supported for TTL mode
• Do NOT plug USB or flash while BMCU is connected to the printer

Firmware

Latest BMCU firmware: https://github.com/jarczakpawel/BMCU-C-PJARCZAK

GUI has "Online" firmware selection (no manual searching/downloading):

• choose mode (Standard / Soft load / High force)
• choose slot (SOLO / AMS_A / AMS_B / AMS_C / AMS_D)
• choose retract length, AUTOLOAD, RGB
• the app downloads the selected firmware and flashes it

Drivers (CH340)

In USB mode (CH340), drivers may be required on Windows. Linux and macOS usually work out-of-the-box.

Usage

GUI (recommended):

• Run the app
• Click "Online" to pick the exact firmware variant (mode / slot / retract / autoload / RGB)
• Click "Help" inside the app (wiring + BOOT/RESET steps)

Android:

• Install APK
• Choose USB or TTL mode
• USB mode: plug BMCU via USB OTG
• TTL mode: connect external USB-Serial adapter and enter BOOTloader manually
• Select firmware options
• Click "Flash"

CLI (optional):

• USB (auto port by VID/PID):

python3 bmcu_flasher.py firmware.bin --mode usb

• TTL (manual BOOT+RESET, port required):

  python3 bmcu_flasher.py firmware.bin --mode ttl --port /dev/ttyUSB0

License

MIT - see LICENSE.