JanOS ESP32-S3

Flash JanOS straight from your browser

WebSerial flasher powered by esptool-js. Click Connect, pick the M5MonsterC5-Cardputer serial port (Chrome/Edge desktop), then Flash to stream bootloader, partition table, and firmware from the latest GitHub Release.

Control

Ready to connect.

Release info

Loading manifest

  • ROM mode: Hold BOOT on the M5MonsterC5-Cardputer, plug the board in, then release.
  • Close serial hogs: quit qFlipper/monitors or anything holding the COM port.
  • Stuck- Unplug, re-run Connect, plug again with BOOT held, then Flash.
  • Reset: after flashing, press RESET on the board if it does not auto-reboot.

    • What happens

    Using esptool-js directly: enter stub, set baud, then flash each image at the offsets from manifest.json. Progress and MD5 checks mirror the Python esptool flow.

    Need offline?

    Grab the same assets from Releases and run flash_board.py in binaries-esp32s3 if your browser blocks Web Serial.

    Browser support

    Chrome or Edge on desktop over HTTPS. Web Serial is required. If you see Web Serial not available, switch browsers.